When in transit - Got a tool box on the back of my truck that locks.... Leave the key with dealer, i drive home, he follows me with the key to my box and gives it to me when im home.
At home ive been known to remove the front of an electrical outlet, stash in there, and screw it back on.
At home ive been known to remove the front of an electrical outlet, stash in there, and screw it back on.