And it isn’t just the NRA. Many gun owners don’t own any firearms that were sold through a FFL, so think the fact that they own them isn’t known. The USPS (essentially the federal govt.) knows if you get mail from Cabelas, Midway, Guns and Ammo, Outdoor Life, etc. It isn’t really a stretch for them (USPS and, by extension, law enforcement) to figure out who likely has firearms.
molon labe
Ask for a plain brown wrapper.