I believe all the groups (scientific, "scientific", and vets) that have caught any wild burms have euthanized them. I'd imagine it's not legal to keep them sadly. You have to remember that they are literally wild, and wouldn't be as cute and cuddly as the ones people breed. They will see you as a predator. They would also be riddled with parasites and possibly disease that could contaminate any others in your collection.
Edit: I just want to add that I really have no idea, this is purely my own speculation.