Is this the one that you bought? If not, search on the "sold" listing by typing in your "search" and then go to the advanced setting upper right and check "sold" listings but don't type in micro. Just inspect the list of coins and find one that is a micro D that the seller didn't know about.
They are somewhat hard to find, but not as scarce as originally thought. I have no idea what you can get for it. You should keep it. It's a neat find. Just remmebr that Ebay takes about 1/3, including the mailing and tax.