Yea, when asked about the address he responded that it was on the envelope he sent with the check. I didn't even look at it there, why would I? If you have one listed as the correct one with gunbroker I'm not bothering to double check its the same as the enevlope. Now maybe if he had included a note that said something along the lines of he knows his gunbroker one is wrong, but please send it here. Even then though, I would wonder why he didn't update his gunbroker account.
Obviously this all could have been avoided had he updated his address, and I think I will let him know that.