My first mystery part!

I’ve been working on rebuilding my carbs. (S1, 3.8) In order to get to that point, I recently did the following on the passenger side of the engine:
-removed air box
-removed air filter canister
-removed intake manifolds with carbs and water jackets intact
Yesterday, I was walking through the garage past that area and saw a metal piece on the floor that I didn’t recall seeing there before. Photo is attached. My question is, did this come from the car or is it something that someone in the family dropped while walking through the garage? I don’t remember removing it or seeing it anywhere when I took stuff off. Thanks.