It's actually not the uncommon to happen. A friend of mine sold a car to a guy like this. Some guy came to his house with 2 fully armed body guards and bought his car. It was a high dollar car and bought with cash. The guy left it there for a long time then had it hauled to a transmission shop in Fl. where it sat for about 2 or 3 years before it finally was picked up and shipped.
I'd asked a lawyer, but I'm sure there is a certain amount of time they have to pick it up.