When I was working for GE, I was working onsite in the Ford truck plant in Virginia. We went to another building and cut through where there was a conveyor that brought the cabs over from another building down to the line.
This was a connection between the buildings. Kind of a tunnel, but it was about 3 or 4 stories high with walkway and conveyor connections. No access except from the buildings it connected.
This had to be 1997 as they had just switched to the newer (at the time) style F-100 truck.
The guy that was with me told me to look down... and there was a cab from an earlier series sitting there on the floor under the conveyor. It was in a spot that you couldn't really get to and it was out of the way. It had probably fallen 3 stories to the floor at ground level. He said it had been there at least 10 years, and you could see that it was 2 generations of F-100 earlier. He told me that they had been told to get it cut up and out of there when they had the time, but the time never seemed to come.