Look in the owners manual on replacing a foglight bulb from under the car (1 bolt, 2 clips I believe), it might have fallen around there. If not there then the metal shielding that is removed when doing the oil change ( 2 bolts, and a few gray metal “screws”)At least I think it went into the fender well, as I heard it hit plastic.
Anyway, I was trying to loosen the screws/bolts on the air cleaner (tight as hell from the factory!) and it fell in.
Specifically ,one of these.......Magnet.