Top 7 Mercari Scams Targeting Foreign Sellers in Japan [2026]
Foreigners are disproportionately targeted because the language barrier makes it harder to fight back. This guide gives you the exact phrases and evidence strategies to win disputes — even without fluent Japanese.
Shota Yamada
Former Mercari seller · 2,000+ transactions · Last updated: 2026-05-19
📌 Bottom Line
The single best protection against Mercari scams is filming yourself packing every item. With video evidence, you win 90%+ of disputes. Mercari's buyer protection (商品回収センター) compensates sellers for shipping damage with a 99.6% success rate — but only if you used Mercari's integrated shipping service.
The 7 Scams — Detailed Breakdown
1. Switch-and-Return Fraud (すり替え詐欺)
How it works: Buyer receives your item, claims it's damaged or wrong, and sends back a completely different (broken or cheap) item in the return. You get your listing back minus the real product.
Warning signs
- •Immediate complaint right after delivery
- •Refuses to send damage photos
- •Pushes hard for quick refund without Mercari involved
Defense
Film yourself packing with serial number visible. When the return arrives, open it on camera at the post office counter. Weight discrepancy is hard evidence.
Useful Japanese phrase
商品の写真を送ってください (Please send photos of the item)
2. False Damage Claim (破損クレーム詐欺)
How it works: Buyer claims the item arrived broken when it was not. They either send photos of a different broken item or edit the photos. They know a non-Japanese seller may give up rather than fight a dispute in Japanese.
Warning signs
- •Claim arrives more than 24 hours after delivery
- •Photos show damage inconsistent with the item type
- •Buyer escalates quickly without waiting for your response
Defense
Photograph items from all angles before packing, including any existing scratches. Submit your pre-shipping photos to Mercari immediately. Mercari Japan compensates sellers 99.6% of the time when shipping damage is confirmed by the courier.
Useful Japanese phrase
発送前の写真があります (I have photos from before shipping)
3. Aggressive Price Haggling (値下げテロ)
How it works: Not technically fraud, but foreign sellers get disproportionate pressure. Buyers send multiple messages demanding 40–60% discounts, sometimes threatening a bad review if refused.
Warning signs
- •Multiple messages in a short timeframe
- •Threat of bad review
- •Offer price far below asking price
Defense
You are never required to respond to negotiation. One polite decline is enough. Threatening reviews is a rule violation — report it.
Useful Japanese phrase
お値下げはしておりません (I'm not reducing the price)
4. Fake Non-Delivery Claim (未着詐欺)
How it works: Buyer claims the package never arrived even though tracking shows delivered. Common with anonymous delivery methods or when tracking ends at a collection box.
Warning signs
- •Tracking shows delivered but buyer claims non-receipt
- •Buyer is new with no feedback history
- •Item is high value with anonymous shipping
Defense
Use Mercari's integrated shipping (らくらくメルカリ便 or ゆうゆうメルカリ便) — it includes tracking and seller protection. Anonymous doesn't mean untracked with these services.
Useful Japanese phrase
追跡番号: [tracking number] (Tracking number: [number])
5. Unauthorized Cancellation Request (一方的キャンセル)
How it works: After you have already shipped, the buyer requests a cancellation. Accepting means you must pay return shipping and lose the sale. Refusing risks a bad review.
Warning signs
- •Cancellation request after shipping confirmed
- •No legitimate reason given
- •Buyer becomes aggressive when you decline
Defense
Do not accept any cancellation request after shipping. Contact Mercari support directly through the transaction — you are protected if you shipped within the stated timeframe.
Useful Japanese phrase
既に発送済みです (I have already shipped)
6. Counterfeit Returns (偽物送り返し)
How it works: You sell a genuine branded item. Buyer receives it, then claims it's fake. Buyer keeps the real item and returns a counterfeit to you. This is more sophisticated than a standard switch.
Warning signs
- •Claim that expensive branded item is "counterfeit"
- •Buyer has knowledge of authentication
- •Return parcel feels wrong (too light, different packaging)
Defense
Before selling branded items, photograph authenticity cards, receipts, serial numbers, brand tags in detail. Open return parcels on camera at the post office. A returned counterfeit is evidence of buyer fraud.
Useful Japanese phrase
正規品の証明写真があります (I have authentication photos of the genuine item)
7. Receipt of Stolen Goods Claim (盗品主張)
How it works: Buyer (or a third party) claims the item you sold was stolen property. Rare, but foreigners selling inherited items, collectibles, or electronics without receipts are more vulnerable.
Warning signs
- •Police contact after a sale
- •Buyer claims they recognize the item as stolen
- •Item has unique identifiers (serial numbers, engravings)
Defense
Keep purchase records for valuable items. If contacted by police, cooperate fully — you are not liable if you genuinely did not know the item was stolen. Mercari also has a process for these situations.
Useful Japanese phrase
こちらで正規に購入した商品です (This is an item I legitimately purchased)
How to Document Evidence Without Speaking Japanese
Mercari support does not require explanations in perfect Japanese. Photos and videos tell the story. Here is what carries the most weight:
Continuous video showing item condition, packing, and sealing. Best single piece of evidence.
Shows the specific item sold. Makes "wrong item returned" immediately provable.
Shows weight and dimensions at point of shipment. Weight discrepancy in returns is hard evidence.
Documents buyer behavior and timeline of events.
Weakest form of evidence, especially if submitted in non-native Japanese.
How to Contact Mercari Support as a Non-Japanese Speaker
Mercari Japan's support is in Japanese, but you can work around this:
- Open the transaction in the Mercari app
- Tap the three-dot menu → "問題を報告する" (Report a problem)
- Select the closest category to your issue
- Write your explanation in English — then use DeepL to translate it to Japanese, and paste both versions
- Attach all photo/video evidence directly in the report form
Mercari's 99.6% Compensation Rule — How It Protects Sellers
If a package is genuinely lost or damaged in transit (not at the buyer's hands), Mercari's integrated shipping service (らくらくメルカリ便 / ゆうゆうメルカリ便) covers compensation with a 99.6% success rate through their 商品回収センター program.
Key requirement: you must use Mercari's integrated shipping service, not regular post. Regular postal services (普通郵便) are NOT covered by this compensation scheme. This is the biggest practical mistake foreign sellers make.
FAQ
Q.What is Mercari's buyer protection window?
Q.Can I contact support in English?
Q.What evidence does Mercari accept?
Q.A buyer is demanding a refund for damage. What first?
Q.What is the switch-and-return scam?
Sources
- 1. Mercari Japan Transparency Report 2025 H2 — complaint and compensation data
- 2. Mercari Help Center — shipping protection and dispute process documentation
- 3. National Consumer Affairs Center of Japan — online marketplace fraud statistics
- 4. Furima Navi user reports — 2025-2026 scam incident database