Look, I get it. We all sell games we regret. I sold a mint, HUO Maverick, from my personal collection, to a client at xmas once. I still service it to this day and I STILL miss it. But I sold it, it is done and gone. Possession is 9/10ths of the law. He can pound sand. Weather he cashes the check or not, the deal is done and the pin is yours.