whats the wierdest things you found in your car

Not sure if this would be in the weird department but the carpet hasn't been removed since the factory put in in, sooo how did a 1972 fifty cent piece get under the carpet with the rest of all the misc. nuts,screws,etc. Do coins come out before the stamp date? Car was built Nov 71. Thought it was strange. Pic of the tag from the original carpet. Out of the pocket of one of the assembly line workers I guess.