My wife collects little boxes. We've watched all of our favorite 'collectible' goodie stores go broke - and sell their display cabinets. I've bought her several over the years. As she would outgrow them, all vertical glass cases with locking glass doors and lighted, I inherited them - supposedly to display my models. Oops... the knives look better on those glass shelves. I can quickly see what's missing, too - often in time to retrieve them from a pants pocket before it finds it's way into the washing machine.
I worked in our favorite store for a few days as they closed last year - a sad time. My wife did get three full height cases actually branded for her boxes, etc, so last year saw me getting her two half height glass cases, one with a lockable storage base. Fortunately, they all use the same key - and both of my copies were hiding - right where I left them - last week, making me carry a Boker Tree Brand Classic Copperhead all week. One case has my fixed blades, the other, my folders. Many are on clear plastic stands (Buck). The sheaths, boxes, etc, are elsewhere.
Security is secondary here - although I do have a few Benchmades, I have no Sebenzas. Mine are users all, so their pristine condition isn't a given. One could smash the glass and make off with a bunch of inexpensive folders - or fixed blades - without sheaths. I could follow the blood trail, too. At least they can't be picked up by a top mounted handle and toted away full. I had some PRC made wooden chests, like the lower end imported Gerstners, which my wife inherited as those little drawer slots were ideal for small slippies - which I don't have. She keeps them for jewelry!
I do have both a tall and a short digital lock 'safe'. The tall one has plywood strengthened shelves and, certainly neither gas tight or fireproof, is my 'metal container' for my ammo stash. My couple of .22 bolt action rifles are 'elsewhere'; my revolvers are in the short safe. I have no room or need for a big safe for firearms and knives.
I did inherit a corner display cabinet, actually, a corner English antique bar - bought for a song at an auction due to it's 220V lighting. I gutted the lighting, replacing it with several under counter LED can lights - from WallyWorld! The sliding glass - and lower section wood - doors offer no security from the grandkids, so it contains my displaced models, gizmos, etc.
BTW, all three of my wife's current cases, the big one she gave away, the two I inherited ($50 & $75!), and the antique English corner bar and new lights and bulbs (Not cheap!) - all totalled less than $500! Check out those collectible/trinket/gift stores. The new price for such cases ranges from $800-$1,400+ - used, as they can't display other-named goodies in them, they'll go for $35-$300. Another approach to storage...
Stainz