Not really. Mom and dad taught me right from wrong. So I can usually tell which is which.
You may or may not have a legal case. I don't know. I'm not a lawyer. I've hired a few. And have found most of them dull and lacking imagination. But a good one that is creative can sometimes do things for you when people are saying "you have no case", etc.
One thing is for sure, most people will be sympathetic to your view that your pocket has been picked. Which equates to bad public relations for the people that have done the picking. And since those inviolved are paper pushers they may want to cut a deal.
I'd fight fire with fire. Get your story about this "theft" in as many publications as you can. That will put pressure on them to do a deal with you and also have the benefit of more PR for your business. You don't have a choice anyway as you well know.
Best of luck!