> 95% certain

Really now? Have you not been paying attention to the many news stories about banks that are closing out and shutting down their SDB services?

SDB are a horrible burden for banks and especially because they have little use for actual secured vaults anymore.

If you’re simply using it to squirrel away paper documents for emergency access, I strongly suggest an electronic replacement solution.

If you’re using it to store physical valuables such as watches, jewels, or negotiable instruments, then I feel sorry for you, but consider a storage locker or simply a fireproof safe.