It's part of the antigravity generator on an Arcturian spacecraft, Bill! It's just a structural frame that holds some other components in place on those generators, but it's still absolutely priceless. Perhaps your Mom was an abductee? Whatever you do, don't let the authorities know you have that thing or you will get a quick visit from some gentlemen in black suits and they will take it away and you'll never see it again.

Furthermore it could provide a link to you in their ongoing investigation to find the bastard who doesn't believe in King Arther (presently reincarnated as George Bush), and you DON'T want that to happen! Bush only has a few months left now to "smoke you out" and "git you". Play it safe. Lie low.