The buyer is unimportant in this matter. I would advise his name to not be posted because he is not the issue here. He paid for the gun, and was willing to pay for the transfer. No need for him to be drug down with this.
It was the buyer's responsibility to make sure he followed the law in his own state and to make sure that the FFL dealer would accept the firearm. If the buyer actually told Sam's-used-cars... err... the dealer that PP was an FFL then he truly is the issue.
That said, we know what state he is from and not being indicated here will just make some of us decide not to deal with anyone from that state (if there are more than one).