If you cant figure out what any small part you find on the floor or bench is for and after exhausting all avenues of discovering what it is......
Toss it in the trash can. The day after the trash has been picked up , I guarantee you will discover what it is for !
Happened to me yesterday.....I found a charger, for 6 months I kept that thing trying to figure out what it went to. Gave up andTrashed it. next day I see my electric wet/dry razor in the back of the cabinet, you guessed it....it went to the electric razor I forgot I owned.....
Gary