bigboss said:
You can reserve it here, to collect from either Edinburgh or Dublin duty free:
http://www.dixonstravel.com/Bowers-Wilkins-P7-P1233C2.aspx
Speaking of which I had a listen while flying out of Luton (Dixons travel) To be honest I found them too bassy.
But back to the OP's question, if the person has proof of purchase and not registered them, then you can take the receipt off him and register it yourself.... They can't exactly prove it was not you who purchased them. Usually they only ask for the serial number and copy of the receipt. I have sent two things back to bowers in the past for and both times thats all they wanted.
As for fakes.... I doubt it very much too and you always have PayPal covering you. You cannot be sold a fake product on eBay as its against terms and conditions, any such breech would result in a full refund and the case decided in your favour..... How will you know its fake? When you register the product you will know right away.
As I said, make sure its not registered first and he/she has the receipt (importantly that receipt must not contain the persons name or you are snookered). Then of course you will have to trust thier word, and if they lied to you about the registration, then you have no grounds for a refund as you purchased a used item.
You see the hassle above - Just not worth it!