Mingering Mike - an IMAGINARY record collection?!

Does anyone know if any of the original work has ever been for sale? I'm onto art collecting. Need one OG piece.
 
Seems unlikely due to the Smithsonian holding the bulk of what was ever discovered. Though maybe that wasn't Mike's whole oeuvre in the storage unit, I've never heard tell of somebody else falling onto his stuff. Anybody with deeper knowledge? All mine was secondhand through this site basically.