Howdy,
Great site, thanks for a wonderful resource.
My tip of the day for hidden in plain sight storage, is a hollowed out heavy bag. I mean one of those ubiquitous kickboxing bags languishing in so many garages, covered with dust, and often stuffed into a corner and unused for years. These can be found used and cheap and have minimal resale value, thus a low likelihood of being taken in a burglary, especially as they are usually quite heavy. If there is no food or anything inside attractive to a dog or a bear, that is good of course, so nothing leads an intruder to it.
So, if you have some padding around a large tube hidden in this bag, it still can be punched, but can hold rifles, ammo, etc in a fairly large amount, and in fact should be so heavy, that its a pain to move from its dusty spot in the garage. Just re-lash the top (or perhaps re-stitch it, depending on the design), put the hanging chains back on and it hides in plain sight! Happy Trails – Eugene