One that that I was wondering is he said send it back to him and he will sell it and refund you.
Does this mean he expects you to wait until it sells before you get a refund?
At this point, if it was me, I would tell him to go scratch, post on the BOI, and if you are not happy with the looks of the animal, sell it to the person who expressed interest in it (after the QT period-you don't want to inadvertently sell a bad snake).
Good luck.