I used to hit the city car auctions a lot during the 80's. You would always hear stories about people finding stuff in cars they bought, but the only two I ever saw with my own eyes was once when I looked in the glove box of an old Volvo I had just purchased and found a Heuer watch. and another time when a guy who had purchased a beat up on VW Beetle opened the front and found a tool box full of gently used Snap-On tools.

Most of the time you would only find jumper cables and bottles of transmission fluid, but now and then you would get lucky.