Ummmm, do people not already have hidden storage?
Like, places purpose built to be very hard to locate, isolated from damage, and big enough to hold emergency supplies like cash and certain useful objects if the house is invaded like that.
I kinda assumed with lemmy being what it is, it would be a fairly common practice since they aren't that hard to install.
An example might be a small section under a house with a false wall. Or maybe a section of insulation in an attic that's in an out of the way corner and can be cover for a small safe. Stuff like that.
Am I really that far off from the crowd here?