A guy I used to know down in AZ once said "If you leave the door unlocked, how much do you think the jerks would expect to find?" He also used the kickspace trick in built-in cabinets, but he made drawers to fit the space, but with no pull knob. He drilled holes in the side of the cabinet (toward the back) that would just accept a largish nail; to open the drawer, he would have to remove the nail that prevented the drawer from being pulled out. He also had a false floor in the bedroom closet.
But there were things that he never left there, esp weapons. He said if they once find a weapon, they will keep checking. He said if anyone looked in the cabin, it appeared empty, except for things like a broom and dustpan, some stored water, etc.
A Mormon had a lot of storage in his garage. He had built in a false wall in front of an outside wall that had no window or door. Unless you actually measured the inside & compared it to the outside, you never knew it was there. It was a foot deep and held a ton of stuff.
I think one of the main things is not to have a hidey hole that's too far away. If you're caught with just half a tank of gas, it would be nice if it were enough.
Sue