Guess I am the only one that doesn't feel mites as something to reject a reptile over. Mites happen and even the best breeder can have them and ship them. They are so easy to clear up in quarantine, I would not even worry about it.
Oh and PAM cooking spray is a horrible and harmful means to do anything to a snake. Not only is it bad for you, it is bad for the snake's scales and not even close to a rational approach to curing anything. It would be like huffing lysol to cure your cold.