While I am not a lawyer, I am capable of reading [18 U. S. C. 922( a)( 2)( A) and 922( e), 27 CFR 178.31] which is sighted by the ATF’s web site. It is clear to me that the answer to the ATF question simply assumes that the question was not in regard to an “other than�.
(my emphasis above)178.31 Delivery by common or contract carrier.
(a) No person shall knowingly deliver or cause to be delivered to any common or contract carrier for transportation or shipment in interstate or foreign commerce to any person other than a licensed importer, licensed manufacturer, licensed dealer, or licensed collector, any package or other container in which there is any firearm or ammunition without written notice to the carrier that such firearm or ammunition is being transported or shipped:
I have no fear of breaking the law but those that feel different, should pay the excess shipping rather than worry.