Oh come on now. I have dealt with paper trails for years, I am a federal agent. The FFL can easily have a paper trail by saving the shipping label that comes with the gun. If the gun was shipped via UPS or another such shipper, then there is a paper trail that can be printed from any computer by running the tracking number. It is not at all necessary to have an FFL holder ship the firearm to generate a valid paper trail that could be later used to prove the gun was shipped to the dealer at the destination end. Anyone can ship it via a carrier like UPS and their will be a paper trail. The dealer can also ask the person receiving the gun for a copy of the auction results, or sale. He also is, I believe, required to do a NICS ceck and fill out other paperwork.
Just a few years ago, it was either GunBroker.com or AuctionArms.com that plainly stated in their on site regulations that any firearm sold through their site had to be shipped from dealer to dealer - no exceptions.They said this was the law. They were wrong and I sent them an email to let them know. I also directed them to the ATF regulations. To my surprise they, in short order, changed their FAQ about how to ship. I don't know if that was due to me alone or to a number of complaints, nor do I know if they ever went back to the old thing. I do know I have explained the same to FFL holders several times and have been told several times that I am wrong, the law is it must go from FFL to FFL. That is pure bull, and as I SEE IT. I think it only goes to line one another's pockets. Sure an FFL holder could be ignorant of the actual requirements, but these are FFL holders who have been shown the regs. So that is my opinion, based upon mny dealings with FFL holders who claim to outright know better than what the BATFE regulations actually state. They give no reason that it is for a paper trail, they say it is required and that is that (at least the ones with whom I have dealt).
By the way, I am not saying they cannot do this. I am saying I will avoid using them. It is their prerogative to only accept shipments from another FFL just as it is UPS's prerogative to make you go overnight air. UPS does that for another reason than just to make money, they do it so the guns are tracked more carefully and so the guns are in their system for a sorter time thereby cutting down chances of theft by UPS employees and cutting their liability. An FFL holder on the other hand, has a sufficient paper trail to show where a gun came from without having it go through an FFL holder on the sending end. You can choose to use UPS or not, just as you can choose to use such an FFL holder or not. I do not deal with those guys (those FFL holders) if I can avoid it.
All the best,
GB