I guess the big question is if you have the key for it that was famously kept out in the open where everybody knew where it was, (and if there wasn't a spare...) or did the thief take that with him.
If the key was left behind, perhaps a crime of opportunity during the recently-held party. If the thief kept the key, might imply it was passed off to him by an insider.
Here is the frame. I don't have the key, but it is easily opened or locked with an allen wrench. The alarm wires and mechanism seem to still be intact.
It was designed for books in a fortress, but you can put a slab in it or a raw book, but they look best and most centered in a fortress
Interesting. Do they prevent color fading if they were displayed on a place that got a lot of sunlight? Looks like its museum quality glass so...probably safe in sunlight?
Thanks for posting the pictures!