Anyone know what this part is?

When i swapping the engine air filter i noticed this sitting down the very bottom on the belly pan. Any idea what this is? I have no leaks or problems at all. I did change the spark plugs a thousand miles or so ago but looking at the installed ignition coils they all seem to have the same gasket on them and don't look any different. I don't know if this came from the road and doesn't even belong to my car. Suggestions?

 

Unless there is another gasket inside of these then yes. All of them look like this from the outside