Why Would a Stranger Overpay You for Something on a Buy-and-Sell Group?
Someone lists a couch or an old gaming console in a local buy-and-sell group, and a buyer messages back offering to pay more than the asking price, no negotiation needed. It can feel like a stroke of luck. In practice, it’s usually the opening move of a familiar scam script.
The quick answer
A buyer who volunteers to pay more than the asking price, especially with a check, cashier’s check, or payment app transfer followed by a request to send the difference elsewhere, is almost always testing whether the seller will move money before the original payment has actually cleared. The extra amount is the hook, not a gift.
The pattern behind the overpayment
The scam generally follows a script: the buyer sends a payment for more than the item is worth, then explains the overage away with a story, like a shipping company being owed extra, a personal assistant needing a cut, or a “mistake” that needs correcting. The buyer then asks the seller to send the difference back through a separate, often harder-to-reverse method such as a payment app or wire. The seller sees the payment appear in their account, assumes it’s real money, and sends the difference before realizing the original payment was fraudulent. Once that happens, wiring back the difference on a check that overpaid you generally can’t be undone, and the seller is out the full amount they returned.
Why “available” money isn’t the same as cleared money
Banks often make a portion of a deposited check available within a day or two as a courtesy, but that availability is not the same as the check having cleared. A bank can make a fake check available before it’s actually verified, and if the check later bounces, the bank reverses the deposit and the account holder is responsible for the full amount, including anything already spent or sent elsewhere. This gap between “shows up” and “cleared” is exactly what the overpayment tactic depends on.
Why checks and cashier’s checks show up so often
Paper instruments like checks and cashier’s checks take longer to fully verify than most people expect, sometimes weeks, especially if they’re fraudulent and drawn on a legitimate-looking but compromised account. A counterfeit cashier’s check can look convincing enough to pass a casual glance, which is part of why what happens if you deposit a check that turns out to be fake tends to catch sellers off guard. Digital payment app transfers can carry similar risk when the payment itself is later disputed or reversed by the sender’s bank.
What separates this from a genuinely generous buyer
A real buyer negotiating a higher price for convenience doesn’t usually need the seller to route money to a third party afterward. The presence of any request to send funds elsewhere, particularly to an address, account, or person the seller has never dealt with directly, is the signal worth paying attention to, regardless of how the payment method looks on the surface.
The bottom line
Treating any unsolicited overpayment as a reason to slow down, rather than a stroke of luck, tends to be the more reliable approach. Waiting for a payment to fully and verifiably clear, through the bank rather than through what the account balance displays, before sending anything back or shipping an item is the general practice that closes off this particular tactic. Suspected fraud can also be reported through consumer protection channels for further review.