Strangest thing found in your A body???

Since we're talking about any car: I have a '48 Chevy street rod project. With my car I got a p.o.s. parts car with extra doors. As I was stripping the car of it's useful items I turned one of the rusty doors upside down and a little red plastic race car fell out! It was so dirty that i had a hard time identifying it. I took it in the house and cleaned it up with soap and water and found out it was in pretty good shape and appeared to be a replica of a 1930's-1940's fenderless track car. I set it on my desk to look at later and went back to work. A few minutes later a second car came out, this time it was yellow! I cleaned it up too then shook the hell out of the door to see if there were more, but that was it. I have no idea where they came from or how long they were in the door. I can just imagine some little kid back in the 50's riding in the car and stuffing these between the window and sill only for them to be discovered by me 50 years later. I'll post some pics later on and maybe some of you older guys can tell me what they are. My guess is some kind of cereal box giveaway.