diff --git a/src/Decentralized/DealerStock.cs b/src/Decentralized/DealerStock.cs
index 8a2f3a2..7907be3 100644
--- a/src/Decentralized/DealerStock.cs
+++ b/src/Decentralized/DealerStock.cs
@@ -41,6 +41,33 @@ namespace Decentralized
                 Walk(m.panel.transform, 0);
                 Log.Info(sb.ToString());
             }));
+            ModHelper.AddDebugFunction(ModInfo.Id, ModInfo.Name, "Edit claim + offer to buyer (test)", () => Log.Guard("卖出侧测试", () =>
+            {
+                var rng = Session.Data.Rng;
+                // 自己的一张真卡：标签机改成旗舰型号并把成色说成没问题，再摆给一位买家
+                var item = Items.NewCard("RZX70", 55, null, rng);
+                Items.Give(item);
+                var u = Items.ToUnit(item);
+                var c = Claim.Truth(u); c.Model = "RZX90"; c.Fan = 0; c.Fingers = 0; c.Bracket = 0; c.Sticker = 0;
+                item.EnableTag(Items.EditedTag);
+                Items.SetClaim(item, c, 0);
+                var client = new StoreClient { identifier = "pd_test_buyer", displayName = "买家", spriteName = SpriteDict.GetRandomScavSpriteName(), clientIntent = StoreClient.ClientIntent.BUY };
+                client.CompleteClientCreation();
+                PlayerStore.Instance.currentClientInstance = StoreClientInstance.CreateClientInstance(client);
+                Log.Info($"测试：卡 #{item.uniqueId} 说法 {c.Encode()}，真实 {Claim.Truth(u).Encode()}，价格 {item.unitValue}，信誉前");
+                Items.OfferForTest(item);
+                Log.Info($"测试：验货后 Exposed={Items.Exposed(item)} 价格 {item.unitValue}");
+            }));
+            ModHelper.AddDebugFunction(ModInfo.Id, ModInfo.Name, "Buy scam card (test)", () => Log.Guard("买入侧测试", () =>
+            {
+                var rng = Session.Data.Rng;
+                var item = Items.NewCard("RZX90", 60, "RZX60", rng, DealerKind.Scammer, 0);
+                long before = item.unitValue;
+                GeneralHelper.SetItemOwned(item, true);
+                Items.Refresh(item);
+                Items.Give(item);
+                Log.Info($"买入测试：卡 #{item.uniqueId} 买前报价 {before}，买下后价值 {item.unitValue}，真实 {CardValue.True(Items.ToUnit(item))}，说法 {(Items.GetClaim(item)?.Encode() ?? "无")}");
+            }));
             ModHelper.AddDebugFunction(ModInfo.Id, ModInfo.Name, "Dr. Jackson stock (test)", () =>
             {
                 EmporiumEntry.Instance.ClearFrontInv();
diff --git a/src/Decentralized/Items.cs b/src/Decentralized/Items.cs
index 517d19f..568a12f 100644
--- a/src/Decentralized/Items.cs
+++ b/src/Decentralized/Items.cs
@@ -22,7 +22,7 @@ namespace Decentralized
         public const string FakeTag = "PD_FAKE_OF";
         public const string RefurbTag = "PD_REFURBISHED";
         public const string DeadTag = "PD_DEAD";
-        public const string LookTag = "PD_LOOK", BackTag = "PD_BACK", SeedTag = "PD_SEED", ClaimTag = "PD_CLAIM", ExposedTag = "PD_EXPOSED", MarkupTag = "PD_MARKUP";
+        public const string LookTag = "PD_LOOK", BackTag = "PD_BACK", SeedTag = "PD_SEED", ClaimTag = "PD_CLAIM", ExposedTag = "PD_EXPOSED", MarkupTag = "PD_MARKUP", EditedTag = "PD_EDITED";
 
         public static Action OpenTerminal;
 
@@ -111,7 +111,11 @@ namespace Decentralized
             var item = ModHelper.SpawnItem(GpuId(model));
             var u = new Unit { Model = model, FakeOf = fakeOf, Health = health, Look = CardLook.Generate(rng, health, fakeOf != null) };
             Store(item, u);
-            if (seller != null) SetClaim(item, CardLabels.DealerClaim(u, seller.Value, rng), 0, markupPct);
+            if (seller != null)
+            {
+                GeneralHelper.SetItemOwned(item, false);   // 卖家的货：买下之前不属于玩家，说法才有效
+                SetClaim(item, CardLabels.DealerClaim(u, seller.Value, rng), 0, markupPct);
+            }
             return item;
         }
 
@@ -125,9 +129,11 @@ namespace Decentralized
         /// 自己的卡摆给想买的顾客：说法里隐瞒的每一项，顾客有 35% 的概率看出来；看出来就拆穿这一项（价格回到真实情况），
         /// 并且掉一点信誉。每位顾客对每张卡只看一次。说法比实际更差（把好卡说差了）顾客不会去指。
         /// </summary>
-        private static void OnOffered(GameItem item)
+        public static void OfferForTest(GameItem item) { checkedItems.Clear(); OnOffered(item, true); }
+
+        private static void OnOffered(GameItem item, bool force = false)
         {
-            if (item.IsTag(DeadTag) || !GeneralHelper.IsItemOwned(item) || !item.IsRootedInBackInv()) return;
+            if (item.IsTag(DeadTag) || !GeneralHelper.IsItemOwned(item) || (!force && !item.IsRootedInBackInv())) return;
             var ci = PlayerStore.Instance.currentClientInstance;
             var client = ci?.GetClientBlueprint();
             if (client == null || (client.clientIntent != StoreClient.ClientIntent.BUY && client.clientIntent != StoreClient.ClientIntent.SELLNBUY)) return;
@@ -210,6 +216,7 @@ namespace Decentralized
             var claim = GetClaim(item) ?? Claim.Truth(u);
             claim = row == CardLabels.RowSpec ? new Claim { Model = model ?? claim.Model, Fan = claim.Fan, Fingers = claim.Fingers, Bracket = claim.Bracket, Print = claim.Print, Sticker = claim.Sticker } : claim.With(row, value);
             int exposed = Exposed(item) & ~row;
+            item.EnableTag(EditedTag);
             SetClaim(item, claim, exposed);
         }
 
@@ -226,6 +233,13 @@ namespace Decentralized
         private static void SyncValue(GameItem item)
         {
             if (item.IsTag(DeadTag)) return;
+            // 买下之后卖家的说法作废：卡回到真实情况，除非玩家用标签机自己改过
+            if (GeneralHelper.IsItemOwned(item) && item.IsTag(ClaimTag) && !item.IsTag(EditedTag))
+            {
+                item.ModifyTag(ClaimTag, t => t.Disable());
+                item.ModifyTag(ExposedTag, t => t.Disable());
+                item.ModifyTag(MarkupTag, t => t.Disable());
+            }
             var u = ToUnit(item);
             string desc = Desc(item, u);
             if (item.shortDescription != desc) item.shortDescription = desc;