I'm no expert in Blood pythons genetics could have played a roll in the money return, but....
This could have been avoided by shooting him a message (over facebook) which you and him made various back and forth messages. Could have been as simple as " I sent back your money, blah blah is'nt at 100% and I can't risk shipping"
Bam
No boi
To OP I believe you may have jumped the gun a bit eh. She seems rather reasonable, this is not uncommon actually... rather expected nowaday's with the reptile trade things happen, at very least you got your money back I would be extremely grateful for that you could have....
-Been without money and snake looking to get your money back for fraud...
-Been sent a sick snake and been forced to dump more $$ into a snake for vet, and Antibiotics.
Be grateful