SCAAAAAAAAAM!
It's a scam! SCAM!
Just say, here's the PO Box # and you will hold the machines for X amount of time, at which point they will be relisted. If he sends a check for "more than the amount" tell him sorry, but they're relisted...why? Because it's a SCAAAAAAAM!
And then just laugh, because you're too smart for him. ;)