The other day, I ran a PuG onyxia, because my guild doesn't run it anymore, So what happened was, I wanted the Bloodletter and it dropped. I rolled and didn't win, So right away I ticketed a GM saying, The person accedently Master looted it to the wrong person, Can't you take it from him and send it to me?
The GM finally got on and asked if i had time, etc etc., And he said, like always when retreiving an Item, you only have a few times you can do this etc. then i logged out, the next day Bloodletter was in my Mailbox! :]