Mas, let me know how you get on with this if you persue it. (PM me if you like)
I'm in exactly the same position and looks like im going to lose out to the tune of £400! Basically someone had their account hijacked , paid me from that account, i sent the item but didn't notice the un-verified address!
2 weeks later the actual account holder noticed and cancelled the transactions.
I have the name and address of the person to whom the item was sent, (and signed for), checked 192.com and the same name comes up as the occupant of the address!
Police dont want to know, paypal/ebay dont want to know!! Surely this is classed as theft/fraud???
I'm currently e-mailing the Paypal financial ombudsman but i'm not too hopeful! Will let you know how i get on!
Rob