They stole all of those?!?
That sounds like an "inside" job to me- meaning somebody knew what was in there, and where it was stored. Your "whodunnit" list needs to start with people who knew about all of that.
And, just as a preemtive covering, I have a similar very rare desert camo Illustrator, including the matching 7-oz tank and barrel. I've had it for over ten years, and I dusted it off this summer hoping to fix it up over the winter. So if I show pics, I didn't swipe yours.