diff --git a/apps/importer/src/shopee/__tests__/dist-exports.smoke.mjs b/apps/importer/src/shopee/__tests__/dist-exports.smoke.mjs
index a7a985ba..ab05ac84 100644
--- a/apps/importer/src/shopee/__tests__/dist-exports.smoke.mjs
+++ b/apps/importer/src/shopee/__tests__/dist-exports.smoke.mjs
@@ -27,6 +27,7 @@ for (const name of [
   'computeRetryDelayMs',
   'resolveItemModelMode',
   'UnkeyableProductTitleError',
+  'NonNewListingError',
 ]) {
   assert.equal(
     typeof crawlers[name],
diff --git a/apps/importer/src/shopee/__tests__/entity-matcher.test.ts b/apps/importer/src/shopee/__tests__/entity-matcher.test.ts
index 7b38c261..55785b15 100644
--- a/apps/importer/src/shopee/__tests__/entity-matcher.test.ts
+++ b/apps/importer/src/shopee/__tests__/entity-matcher.test.ts
@@ -261,6 +261,40 @@ async function runEntityMatcherSuite() {
     'new',
     'Trade-in promotion ("thu cũ đổi mới") must not misclassify a new phone as used'
   );
+  for (const description of [
+    'Nhận thu máy cũ giá cao',
+    'Hỗ trợ thu mua máy cũ, trả góp 0%',
+    'Thu cũ lên đời, bảo hành 12 tháng',
+    'Đổi máy cũ lấy máy mới tại cửa hàng',
+    'Thu máy cũ đổi máy mới, trợ giá',
+    'Thu mua máy cũ giá cao',
+    'Mới 100% - Thu mua điện thoại cũ giá cao',
+  ]) {
+    assert.equal(
+      detectProductCondition('Điện thoại Samsung Galaxy S24 Ultra 256GB', description),
+      'new',
+      `A trade-in offer (${description}) does not make a new listing used (DOS/Rate#1430)`
+    );
+  }
+  assert.equal(
+    detectProductCondition('Điện thoại Samsung Galaxy S24 Ultra 256GB', 'Máy cũ, pin 90%'),
+    'used'
+  );
+  for (const title of [
+    'Tai nghe Apple AirPods Pro 2nd Gen USB-C Chính hãng VN/A',
+    'Apple iPhone SE 2nd generation 64GB',
+  ]) {
+    assert.equal(detectProductCondition(title), 'new', `${title} is a new device`);
+  }
+  assert.equal(detectProductCondition('iPhone 13 128GB 2nd hand'), 'used');
+  // A bare percentage is a spec or an ad, not a condition; one about the device is.
+  assert.equal(
+    detectProductCondition(
+      'Tai nghe Anker Soundcore Liberty 4 NC Mới 100% Chống ồn 98% Chính hãng'
+    ),
+    'new'
+  );
+  assert.equal(detectProductCondition('iPhone 13 Pro 128GB máy 98% pin 99%'), 'like_new_99');
   assert.equal(
     detectProductCondition('Điện thoại Apple iPhone 15 Pro Max 256GB Likenew 99% Zin Nguyên Bản'),
     'like_new_99'
diff --git a/apps/importer/src/shopee/__tests__/shopee-to-supabase.test.ts b/apps/importer/src/shopee/__tests__/shopee-to-supabase.test.ts
index c5e3aee9..68826178 100644
--- a/apps/importer/src/shopee/__tests__/shopee-to-supabase.test.ts
+++ b/apps/importer/src/shopee/__tests__/shopee-to-supabase.test.ts
@@ -17,7 +17,7 @@ import {
   normalizeScrapedProductPrices,
   platformReviewIdFor,
 } from '../shopee-to-supabase.js';
-import { UnkeyableProductTitleError } from '../product-normalizer.js';
+import { NonNewListingError, UnkeyableProductTitleError } from '../product-normalizer.js';
 import type { RateSupabaseClient, ShopeeProduct, ShopeeReview } from '../types.js';
 
 function createBaseProduct(overrides: Partial<ShopeeProduct> = {}): ShopeeProduct {
@@ -532,6 +532,48 @@ async function runTests() {
     UnkeyableProductTitleError
   );
   assert.equal(accessoryEvents.productUpserts.length, 0);
+  // A used, like-new or refurbished listing is rejected before anything is written, with
+  // or without a hint: its price would become the new device's min_price (DOS/Rate#1430).
+  for (const [title, hint, condition] of [
+    ['Like new 99% iPhone 15 128GB', undefined, 'like_new_99'],
+    ['Điện thoại iPhone 14 Pro Max 128GB Máy cũ đã qua sử dụng', 'master-hint-verified', 'used'],
+    ['Apple iPhone 15 Pro 256GB Hàng Tân Trang Apple CPO', 'master-hint-verified', 'refurbished'],
+    // A control character inside the phrase is stripped before the check.
+    ['Apple iPhone 14 Pro Max 128GB Máy\u0000 cũ', 'master-hint-verified', 'used'],
+  ] as const) {
+    const { stub: nonNewStub, events: nonNewEvents } = createPipelineStubSupabase({
+      hintRow: { id: 'master-hint-verified' },
+    });
+    await assert.rejects(
+      new ShopeeIngestionPipeline({ supabaseClient: nonNewStub, apiKey: '' }).ingestProduct(
+        createBaseProduct({ title }),
+        undefined,
+        hint ? { masterIdHint: hint } : {}
+      ),
+      (err: unknown) =>
+        err instanceof NonNewListingError &&
+        err.code === 'NON_NEW_LISTING' &&
+        err.condition === condition
+    );
+    assert.equal(nonNewEvents.productUpserts.length, 0, `${title} writes no listing`);
+  }
+  // Only the title rejects: description boilerplate that reads as non-new (a negation,
+  // "99% khách hàng") keeps a new listing (DOS/Rate#1430).
+  for (const description of [
+    'Nhận thu máy cũ, hỗ trợ trả góp 0%',
+    'Cam kết hàng chính hãng, không bán hàng cũ, hàng tân trang',
+    '99% khách hàng hài lòng',
+  ]) {
+    const { stub: descStub, events: descEvents } = createPipelineStubSupabase({
+      hintRow: { id: 'master-hint-verified' },
+    });
+    await new ShopeeIngestionPipeline({ supabaseClient: descStub, apiKey: '' }).ingestProduct(
+      createBaseProduct({ description }),
+      undefined,
+      { masterIdHint: 'master-hint-verified' }
+    );
+    assert.equal(descEvents.productUpserts.length, 1, `${description} keeps the listing`);
+  }
   assert.equal(hintOkEvents.productUpserts[0]?.cluster_id, 'master-hint-verified');
   assert.equal(hintOkEvents.productUpserts[0]?.category_id, 'cat-smartphones');
   assert.equal(
diff --git a/apps/importer/src/shopee/product-normalizer.ts b/apps/importer/src/shopee/product-normalizer.ts
index d5392bda..166d3b2a 100644
--- a/apps/importer/src/shopee/product-normalizer.ts
+++ b/apps/importer/src/shopee/product-normalizer.ts
@@ -96,6 +96,8 @@ export interface NormalizedProductCandidate {
   storage_gb: number | null; // null = unparseable from the title; identity carries ':unknown'
   needs_review: boolean; // true when identity could not be confidently derived or listing is non-new (plan v7 §5.2, Audit C6)
   condition?: ProductCondition;
+  /** The condition the sanitized title alone states; the ingest check reads it (DOS/Rate#1430). */
+  title_condition?: ProductCondition;
   origin?: ProductOrigin;
   ram_gb: number | null;
   screen_size_inch: number | null;
@@ -134,16 +136,40 @@ export class UnkeyableProductTitleError extends Error {
   }
 }
 
+/**
+ * A used, like-new or refurbished listing. `rate.products` stores no condition, so
+ * linked to a master its lower price would become the new device's `min_price` and
+ * feed the deal radar. The listing is rejected before anything is written until
+ * condition is stored (DOS/Rate#1430).
+ */
+export class NonNewListingError extends Error {
+  readonly code = 'NON_NEW_LISTING';
+  readonly condition: Exclude<ProductCondition, 'new'>;
+
+  constructor(title: unknown, condition: Exclude<ProductCondition, 'new'>) {
+    super(
+      `Cannot ingest a non-new listing (condition=${condition}): ${JSON.stringify(String(title ?? '').slice(0, 200))}`
+    );
+    this.name = 'NonNewListingError';
+    this.condition = condition;
+  }
+}
+
+/** A trade-in offer for the buyer's old device, which says nothing about the listing's own. */
+const TRADE_IN_PHRASE =
+  /(?:thu|đổi)\s*(?:mua\s*)?(?:(?:máy|điện\s*thoại)\s*)?cũ\s*(?:lên\s*đời|(?:lấy|đổi)\s*(?:(?:máy|điện\s*thoại)\s*)?mới)|thu\s*(?:mua\s*)?(?:máy|điện\s*thoại)\s*cũ/gi;
+
 /**
  * Detect listing physical condition from product title and optional description (Audit C6).
- * Strips promotional trade-in phrases ("thu cũ đổi mới") before matching so new retail listings
- * offering trade-in programs are not misclassified as used devices.
+ * Strips promotional trade-in phrases ("thu cũ đổi mới", "thu máy cũ lên đời") before matching
+ * so new retail listings offering trade-in programs are not misclassified as used devices; a
+ * non-new listing is rejected at ingest (DOS/Rate#1430).
  */
 export function detectProductCondition(title: string, description?: string): ProductCondition {
   const safeTitle = typeof title === 'string' ? title : '';
   const safeDesc = typeof description === 'string' ? description : '';
-  const cleanTitle = safeTitle.replace(/thu\s*cũ\s*đổi\s*mới/gi, ' ');
-  const cleanDesc = safeDesc.replace(/thu\s*cũ\s*đổi\s*mới/gi, ' ');
+  const cleanTitle = safeTitle.replace(TRADE_IN_PHRASE, ' ');
+  const cleanDesc = safeDesc.replace(TRADE_IN_PHRASE, ' ');
 
   const checkSource = (text: string): ProductCondition | null => {
     if (
@@ -154,14 +180,14 @@ export function detectProductCondition(title: string, description?: string): Pro
       return 'refurbished';
     }
     if (
-      /(?:\blike\s*new\b|\blikenew\b|mới\s*9[5-9]%|đẹp\s*9[5-9]%|zin\s*9[5-9]%|\b9[89]%|siêu\s*lướt|hàng\s*lướt|máy\s*lướt|hàng\s*trưng\s*bày|máy\s*trưng\s*bày|\bopen\s*box\b|đã\s*kích\s*hoạt\s*bảo\s*hành)/i.test(
+      /(?:\blike\s*new\b|\blikenew\b|mới\s*9[5-9]%|đẹp\s*9[5-9]%|zin\s*9[5-9]%|(?:máy|ngoại\s*hình|hình\s*thức|keng|pin)\s*9[5-9]%|siêu\s*lướt|hàng\s*lướt|máy\s*lướt|hàng\s*trưng\s*bày|máy\s*trưng\s*bày|\bopen\s*box\b|đã\s*kích\s*hoạt\s*bảo\s*hành)/i.test(
         text
       )
     ) {
       return 'like_new_99';
     }
     if (
-      /(?:máy\s*cũ|hàng\s*cũ|điện\s*thoại\s*cũ|đã\s*qua\s*sử\s*dụng|\bsecond\s*hand\b|\b2nd\b|thanh\s*lý\s*máy\s*cũ|máy\s*trần\s*cũ)/i.test(
+      /(?:máy\s*cũ|hàng\s*cũ|điện\s*thoại\s*cũ|đã\s*qua\s*sử\s*dụng|\bsecond\s*hand\b|\b2nd\s*hand\b|thanh\s*lý\s*máy\s*cũ|máy\s*trần\s*cũ)/i.test(
         text
       )
     ) {
@@ -3218,6 +3244,7 @@ export class ProductNormalizer {
       storage_gb: storageKnown ? storageGb : null,
       needs_review: !keyable || !storageConfident || condition !== 'new',
       condition,
+      title_condition: detectProductCondition(title),
       origin,
       ram_gb: ramGb,
       screen_size_inch: screenSize,
diff --git a/apps/importer/src/shopee/shopee-to-supabase.ts b/apps/importer/src/shopee/shopee-to-supabase.ts
index f2730ced..7f453324 100644
--- a/apps/importer/src/shopee/shopee-to-supabase.ts
+++ b/apps/importer/src/shopee/shopee-to-supabase.ts
@@ -18,6 +18,7 @@ import {
 } from './types.js';
 import {
   isAccessoryTitle,
+  NonNewListingError,
   ProductNormalizer,
   UnkeyableProductTitleError,
 } from './product-normalizer.js';
@@ -538,6 +539,14 @@ export class ShopeeIngestionPipeline {
     if (candidate.keyable === false && (!options.masterIdHint || isAccessoryTitle(product.title))) {
       throw new UnkeyableProductTitleError(product.title);
     }
+    // A used, like-new or refurbished listing is rejected even with a hint: with no
+    // stored condition, its price would become the new device's min_price (DOS/Rate#1430).
+    // Only the title decides: description boilerplate ("không bán hàng cũ", "99% khách
+    // hàng hài lòng") would drop new listings, so a description hit still only sets needs_review.
+    const condition = candidate.title_condition ?? 'new';
+    if (condition !== 'new') {
+      throw new NonNewListingError(product.title, condition);
+    }
 
     // 1. Upsert merchant
     const entityHash = hashEntity(`${platform}:${product.shop.shopId}`);