Having a refund policy wouldn't make any difference, I would still be forced to accepted the return by eBay anyway.
Not True. eBay's policy is that if he opened up the computer, he CAN'T get a refund.
I know this because I had a person try to scam me on eBay, and eBay took my side
and I didn't have to refund them anything.
I guess it doesn't matter now, but you should know that for the future..