More commonly, the original transaction looked legit, but turns out after a few days not to be. A common medium is a cashier's check; they seem more "real" than

More commonly, the original transaction looked legit, but turns out after a few days not to be. A common medium is a cashier's check; they seem more "real" than checks, but they aren't really, and it can be a week or longer before you find out one is bogus.