Screenshot looks shady. There is no reason for half of it to be cut off yet it is which leads me to believe he is hiding something.
As far as sending it to performlab1 in the first place i call bullshit on that. There is a chance when giving out your name/email for a trade/transfer that you make a spelling mistake or you leave something out, i have rarely if ever seen someone add on an extra number or letter at the end by mistake. So im willing to bet that qcnb gave the right username and so even if the send it to the wrong username its still on him to send it again to the right name( saying that i dont even believe that he sent it to the wrong name in the first place)