Layers of concrete and abrasive resistant plate (AR plate) might be a start for home vaults, but I haven’t bothered to design anything, yet (e.g., bolts/latches).
Banks are getting ready for a repudiation of debt. Similar measures were taken in other nations that defaulted and repudiated. In the end, they’ll probably prevent outlaw foreign transactions for a short while and do whatever to prevent currency from leaving the U.S.A.
Eventually, the dollar will most likely fall much with respect to several of the other currencies (see net energy commodities exporters and net manufactured products exporters).
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If the boxes are not protected from loss then why do they care what you have in it?
Obviously, they intend to steal what’s in it when the fed demands them to do so.