I had one like this a while ago. I told them that the item was back up for auction and that the auction ended on XX date. If her payment was received before the end date, I would cancel the auction and send it to her. Otherwise, it was out to the highest bidder.
My inventory is a stack of cash (in my view). Cash that I can't have while the inventory is still "inventory". Bad buyers are stopping me from using MY cash.
I gave up on a perfect score a while ago. As long as it stays in the 97-98 range I am happy. For me, if I had 100%, I would be wasting to much time accomodating morons.
Just my opinion.