I don't like the 2A infringing laws on the books either, and do my part in fighting them, while following those crappy laws, but such is the burdon of being a "law abiding" citizen. That shop is the source of the owners livelyhood, and as the current state of affairs is, the ATF, news outfits, and sheeple look at closing him down for a straw purchase, uncrossed t, or undotted i as a victory. I was present during a similar occurance at a gun show where an ATF agent was "made" by one shop employee, and the next table he visited, he was politely informed "We offer a 10% discount to all military and law enforcement personnel, let me know if there is anything you would like to look at officer", he promptly left. Here in MD our fearmongering leaders are fighting their "war on illegal guns", which actually includes basically all guns, as the crime rate in B-more keeps rising like the wonka-vator, their target tends to be the many honest, small family buisnesses in the area, and as a law abiding gunny, who personally knows, and shoots with a few shop owners, I will do as you did, to politely, and annonimously alert them to any outwardly suspicious activity I see, just as I would alert a neighbor to a suspicious person trying to talk to their kids, or walking around their house at night.