The mystery of the missing checker

Here's a strange but true tale: Our library has a checkers game in the children's area, with oversize checkers for little people to use. Monday one of the black checkers mysteriously disappeared, we searched all over the building hoping to locate the missing checker, but were unable to locate it. On Monday evening one of our library staff was returning home with her family, it was her day off, she saw something black on the side of a gravel road several miles from town. She pulled over to see what it was and it was a black checker. She brought it into work on Tuesday because she said it looked like a piece from our checker set.
Sometimes truth is stranger then fiction.