To me, the sticky point is guy #2 does not own the handguns so he can't legally possess them in any form. Not being the owner, what FFL is going to take possession to ship to guy #1. If they were shipped a Florida FFL, Guy #1 would have to prove legal ownership. What FFL in the PRNJ is going to take possession of any gun from a person who is not the owner for any purpose?
I would place them in a steel box, packed very securely and label the box "car parts", ship them using HIS name and old address as the sender, requiring a signature for delivery and pray! I am in no way suggesting that is a great option but I can't think of ANY legal way to accomplish this deed!
The fact that you posted this a day ago with no response from any of our member FFLs speaks volumes!