I assume the odometer will match the number that the car left with....since the purchaser couldn't get the car started.He just called wants to bring it back on the 3rd of Oct. When he comes in for the Hershey show., trying to work things out. He did nothing with the title. Cluster fu*k.
I would be all over the car checking everything thoroughly before even contemplating offering any money back now. Seems like you have committed yourself to a buy-back deal.....at least make it work in your favour now - if for nothing else but the inconvenience, and potential lost sales to someone else.
Tread carefully is my advice.