Ahh wasn't sure if you could just mail it in or not, been awhile.

If someone gives you a deposit make it known to them that it is not refundable

Generally a deposit is for the purpose of the seller to hold on to the car and miss potential sales for the buyer who gave the deposit in the first place, if they dick you around, you could have sold it in that time you were holding on to it, that money is then compensation to you.

General judge of character for test drive, if you're not sure then you drive it yourself with them rising shotgun

Pretty sure they're custom