I'm sure those are registered in an asset seizure or discovery phase of a lawsuit. Sure nobody knows what's inside, but the bank owns the vault so there's got to be a discoverable record of it. Now, a fire-resistant keep-at-home box might be undetectable if you concealed it well enough.

The problem is, this money is losing value every year. I think he wants to put money away and still earn _some_ interest to combat inflation.