Just got a new 2002 Z28 last weekend! When I pulled out of the garage this morning, I found a rubber plug laying on the ground. It's about 1" long and 5/8" in diameter.

I took it to the dealer, but nobody there recognized it or knew where it might have gone.

I have posted pictures of it:

Picture 1

Picture 2

If anyone can help me identify what this thing is, or if it's even important, I'd greatly appreciate it.

Thanks!