I believe SDBs Safety Deposit boxes are a liability to the banks so they may be fazing out over the long term and so the onus will be upon the private individual to secure his or her own valuables.
One option that I am beginning to favor is contracting a private vaulting facility space shared with my siblings, It's an hours drive from where I live.
My holdings are getting significant enough to justify the cost, and I can write the expense off as a Carrying Cost.
0.00107600 BEE
Seems to be there might be a market for that sort of thing, so as long as they are reliable, that might be a smart move. Plus if you can group together like that even better.