Ironically, your credit card receipts and shipping orders can be kept as registration but your 4473 "technically" isn't in a national database. That's the ultimate irony right here because we buy these things for no steppy and suck the big master card instead. Batfe seized purchase orders when raiding 80% manfs for compliance and they've been indexing 4473s the same way for at least a decade.

For clarification an unfinished lower that has been milled by the owner never needs to be registered unless you live in a fascist state like California. Remember the Nazis also effectively banned Christianity alongside Judaism.