How could they have taken it without being seen? Stick it under their shirt? I don't really see how they could do that. I would think they would need a bucket or a big bag. They are also always in the room with you, even in the back part. Was that the only thing stolen? I also think something is not quite right.
Smells, umm, "fishy" to me. I'm thinking inside job.
I doubt that colony will ever surface again. Its either tucked away in someones display or cut up into frags to maximize $$$. Crazy world we live in !!
I have a large colony of cinnamon polyps that started with 2 heads a few years ago.
When you get your tank up again I'd be happy to give you a few polyps to get your colony going again. Sorry that happened to you.