What About Your Attic?
This is a pretty clever idea. Hide your valuables in your attic, which includes cash. Who would think to go there? It is old, musty, dusty, and not comfortable to crawl around. A burglar might not have time to waste there. I know I would not want to enter some random attic.
No one would ever assume there are valuables there, and it is probably the last place they’d look after intruding. You could hide just about anything among things you’ve stored in the attic for years. You just have to do some work at making it camouflage and make it fit in with all the other things surrounding it.