Before the War, you want your bunker to be open and easily accessible, so you don’t have to go hunting for keys or struggle to remember a passphrase when the missiles come over the horizon. After the War, you want your valuables to be inside the bunker, so you can use your Tiffany broach to buy grain from the raiders. So, all your valuables need to be in the open bunker, but secure from pre-War thieves. Definitely need a vault in your vault.