What is this/where does it go?

It came from this area.

Any ideas as to what it is, or where it came from? To me it looks to be sealed all the way around except for the top where it seems to have broken off of something.
-Amanda
Second quick question, would this cause the engine throw a SES light? I haven't gotten to an advance auto or anything to get the SES checked yet so no code to check right now.
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