Sound logic to me. When hunting, I carry the box the Ammo came from, with a few in it in the truck for my .357. That way, I can reasonably prove I’m abiding by the hunting regs in my state. I would think, the same would apply to self defense Ammo, and proving that it was made by a reputable manufacturer, for the purpose of SD.
It definitely sounds like a ti that Massad would give. He has been used as an “Expert witness” for countless self defense cases and he knows what lawyers and the legal systems look for. If that is something he suggests, I am going to start doing that myself! I also don’t think that having some on hand would ever be a bad thing.