Just to add to your comment about records - if you purchase with a credit card or other non-cash method, keep a record even if it's just notes on a notepad locked in a safe with receipts. It's not entirely out of the question if, in a dire financial system situation, the government decides to question private citizens about the source of either their metal or their ability to maintain income. Whether or not receipts could protect someone is also unsure, but it may be better to have receipts than to not have proof of ownership.