Go to karazhan or any instance which will receive a tier set token. Go to Shattrath and then Ticket a Game Master about the Item and tell them you needed it by accident and it should be given to the rightful owner, someone who was in the raid when the item was looted, actually in the instance with you.
They will tell you some bullshit and may escalate the case, or they will tell you that they have sent the item to the rightful owner and that when you relog the token will be gone...
Heres the part.
DONT relog, go spend the token, after the gm has closed the ticket and has sent the other player the tier token.
Go buy yourself a nice new tier set piece while you're friend can enjoy it too!
Swiftee
-Rules are made to be broken.