All rules were followed with this sale.
I posted an "I'll take it" per the rules.
Member sent me 2 PM's providing his PayPal address for payment.
I followed through with the PayPal payment within minutes of the 2nd PM.
After payment, he has decided to withdraw and has refunded payment from PayPal.
Seems no HF published rules apply to a "seller backing out after accepting sale."
Maybe there needs to be an addition to the forum rules addressing this.