Speaking as a project manager who regularly has to prod ppl to act, my recommendation is to communicate one last hard deadline, like “After three months, I need to complete this sale ASAP. If the game is not removed from my premises by November 16th, I will be refunding your money and re-listing the game for sale.”
While on one hand it sucks to wait any more time for someone to act when they’ve been dragging their heels for so long, a lot of times we aren’t really explicit when we are trying to politely push for a resolution—they know you want it taken care of but they don’t realize that you have reached the end of your patience. So this message bluntly says “Do it now or its not going to happen”. It circumvents a lot of bitching after the fact of “I didn’t know you needed that done!!!!”