A minor follow-up that unfortunately doesn't make anything any clearer.
During the "state of emergency" brought on by Hurricane Dorian I stopped by four firearms/ammunition dealers in Gainesville, FL. Rural King and Wal Mart were not selling either because of said emergency. Bass Pro and a local dealer M&C Army Surplus were both selling. Last Saturday (after the state of emergency had passed) I was in Rural King again and saw they were once more selling guns so I asked him about their not selling earlier in the week. The man working said it turned out only their corporate stores were supposed to not sell guns and ammo, but that the franchise stores could have (but hadn't).
The five days or so the state of emergency lasted could do some real damage to a business who depended on the revenue such sales bring for a large part of their business income. It seems to me this is a question that needs a clear and definitive answer.
Does anyone know if there is some sort of trade organization who might undertake spearheading this?