I could be wrong, but judging by the way it has a recessed groove around the outside to mate up to a seal, and the honeycombing to increase strength against deformation from pressure differentials, combined with the two legs which look to be used to keep something spaced at a set distance or pressure, and the accumulated gunk around the honeycombing pattern, but not in the center of them, I would say it is an airbox cover. Likely from another motorcycle, and not yours.
Perhaps your bike had a torrid affair with a honda and kept the piece as a momento?
*EDIT* Upon running a search for Toyo Roki Seizo, the only relevant thing that came up was a vague reference for an air filter patent.
Did the PO have any other bikes kicking around when you bought it? Maybe you can get a hold of them and let them know you will return their airbox cover for the paultry sum of... one billion dollars.
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