I'm simply nervous about who knows which government agency that comes knocking that a simple defense of " O well I've been redeeming all my checks for lawful money" is going to have enough weight to send them walking. I'd like to kinda always be prepared . So for shit and giggles lets say what "paperwork, law wise" would you walk around with in your back pocket at all times to always be able to answer or rebut any questions, whenever??