[chickpea]

I am sorry your coworkers are so nasty and rude. What they did was wrong and it is completely understandable why you are upset. People like that should not be in education.

I have had similar experiences with unique projects and activities. Fortunately, our administration stepped in and the thief was forced to stop using many of the stolen items. I think it depends on the quality and character of your principal whether you ask for their help or not.