Sellers can be victims of fraud when buyers send fake checks or money orders that are detected by the bank only after the seller has shipped the goods. A buyer might offer to use a cashier's check, personal check, or corporate check to pay for the item you're selling. Sometimes, the buyer sends a fake check or money order that exceeds the cost of the item that has been purchased. The so-called buyer (or the buyer's "agent") states that he made a mistake, or comes up with another reason for writing the check for more than the purchase price. In either case, the buyer asks you to wire back the difference after you deposit the check. You deposit the check, learn that it has cleared, and wire the funds back to the "buyers." Later, the bank determines that the check is fraudulent, leaving you liable for the entire amount. The checks were counterfeit, but good enough to fool unsuspecting bank tellers.