My dad lost his wallet in the Dallas airport, somehow. (Luckily, he was on his way home when it happened.) Some kind soul found it, got our address off his driver's license, and mailed it to him, cash and everything still in place. Dad sent him a very nice thank-you note.

More recently, he left his wallet in a hotel room in Boston and checked out. He discovered his lack of wallet when he got to the airport. (They did let him on the plane. How, I do not know. I think he had alternate but unconventional forms of picture ID on him.) The hotel housekeeping found it, and the hotel called his cell phone to tell him they had found his wallet and that they'd FedEx it.

Yes, my dad has a knack for losing his wallet while traveling.