For what it is worth, I just got off the phone with some supervisor at UPS regarding shipping a black powder replica revolver from private residence to private residence. He said emphatically that UPS forbids such shipments. He said they have arrangements with companies such as Bass Pro etc. and the manufacturers to ship these items but unlicensed private parties cannot use UPS unless they are returning a gun to the manufacturer or company. What the ATF says does not concern UPS, this is their rule.
I don't know if he knows what he is talking about but he did not waiver.