I did something stupid

Is there a reason you are jumping straight to flushing $3000 down the drain? If someone sent me money to buy something and it fell through then I would have no problem giving them a total or partial refund. Has the seller stated that they are keeping the car and the $3000?
No, but I don't think he HAS the money. He sold because he needed it. I'm 100,000% willing to write it off because he needs the money and I forgot how stupid I am. That was money I'd budgeted for an A body. Since I'm not going to get one when this implodes, it's no big deal.