Last one I did (PPT) they would not accept the brown change of address card.
They did however, accept two vehicle registrations as two proofs, since they are two separate government issued documents. I would check with the FFl if you plan to use this method though, as the clerk didn't think it was ok, but the manager said yes, it is.
Do you have more than one vehicle registered in your name?
Too many hobbies, Too little time.
Mind you, I'm 5'7", 180, with a visible Ab...