The moment you subordinate a business to do the protecting of your assets you have failed in protecting them properly. They're not going to fucking drill out a safe when you fail to make payments for occupying the safe, of course they will have a key or have the combination. In most banks an attendant will verify your identity and bring the box out into a secure room, unlock it in front of you and leave. When your done you call for the attendant, they verify its locked and take it back into the vault. 

Your goods are safe from other individuals, not the government.