My opinion is useless here, but I'm gonna side with possum on this.
Your really freaking the fuck out over this. Your upset, we get it.
He said he'll refund you. Great.
You still don't seem to realize, if you file a claim, YOU STILL HAVE TO SHIP THE A ARMS BACK BEFORE YOU GET ANY MONEY!
But you really are going nuts. You gave him what 6 hours to respond? Peoples lives don't revolve around computers and smart phones to be checking in on shit all day.
How is he supposed to know your gonna send the a arms back. You can send a box of rocks with a tracking number and PayPal won't know. They have a tracking number. So in there eyes you were right. But your not.
It goes both ways.