Boy , that's a weird one Joe . If it was on top of the fender tag in one of the screw holes it may be a shipping tag to be removed by the dealer. Otherwise it may be as you thought and be an inspection tag . Talk about weird , I pulled a "66 Coronet 500 out of a back yard that had a /6 in it . checking the VIN confirmed the engine . Car was way too far gone . Took the VIN and the fender tag and sent it to Govier . Truly "one of none"