I have hidden wall safes that look like outlets I use for most of my smaller goodies. Not tough to get into, but 99% of people wouldn't think twice about them. Tho they don't hold much so I have 7 thru out my house lol
Those are nice just don't have them in places where people might try plugging things into them.
My bro has a large safe that looks like a real rock out behind his poolhouse...so real that no one thinks there's a safe hidden inside