REMEMBER...Paypal is crap (FOR THESELLER)...as if the buyer opens a incident...and wins,,,,they can come to you and get $$ from your paypal account.
Even if you transfer the $$ from Paypla to your account...they put a neg balance on you...then you owe paypal.

If it is lagit...he will loose 10%.
But if some how he gets paypal to give a refund you owe total.

One thing for sure,,,,IF you ship....get a photo of the SN and be sure it is on the e-bay listing OR a e-mail to buyer ALL through e-bay messages...DO nothing outside of e-bay itself.

He might have a bad on, complain it is not as advertised....do a swap when he returns it.

Good luck.
Lee