Ah Hah! Very tricky....But also very stupid..... (Laugh in reference)
Actually, not a bad idea. Most knotheads would see the empty safe, and maybe some empty ammo cans and conclude that there is nothing worth searching for...Then again, there are those with the criminal minds like me...
I do like the simple and straightforward method of throwing the vermin off the track. Sometimes, simple is best. For my part, local caches are the answer. Even if I can't get anything but my wife and kids out before all hell breaks loose, I do not care. I have those to fall back on.