While I wouldn't put things that could single-handedly grant access in there - since you likely won't be checking on if it's been compromised that frequently - I think it's still great for things like backup 2FA codes or recovery passwords for encrypted media that's stored separately. Make breaking into the box one of the things an attacker would need to do.
I would not put my life savings in jewelry or something in there, but having an off-premise spot for emergency backup codes and stuff like that? Where's a better option?