Most likely dropped from recent work.
You won't believe what tools I've found in my car!!
Miniature ratchet sets, plastic clips, screwdrivers, rags, even a Durametric hand tool (that I stupidly returned).

If you are mildly handy, you can take off the bumper and get a better look at what's going on.
There are tons of online videos that will talk you through these simple steps.

First time I did this I found lose COV's and missing grommets.
Somewhat expected given how cramped it is in there, and how the tech's are timed to the minute.

 

I have to wonder where all those missing rubber grommets end up. Not in the intake, I hope.