Dr Mr Yarrow (aka scumbag),
You need only arrange for an expedient return of all currencies to Mr Scott, therefore paid in full previously by Mr Scott, including but not limited too, cost of items purchased, cost of shipping, handllng costs, plus any taxes due. You should also send a letter to PayPal, admitting fault, so that no negative intentions are applied to Mr Scott's trustworthiness. There is no reason to discuss anything else, other than when the trucking company will pick up the motor, at your cost, and direction. once payment is received in full.
If you send a cashiers check, I would advice Mr Scott to wait the mandatory period, for proper clearing of the check, usually one to two weeks. If you send a personal check, I would recommend he wait the mandatory time required for your check to clear. If you send cash, well, cash is good. But, not wise to send in the mail. I would also advise you against hand delivering it. Maybe you could wire him the money. It is obvious, you are very well versed in the manipulation of PayPal, I would advice Mr Scott to avoid using that service, since he seems to be at some disadvantage, and has lost all trust in the service.
Please make this right, today. Have you ever heard of the six degrees of Kevin Bacon? I think we are down to one or two degrees, in your case.
Thank you, and have a nice day.
Wade