Trying to Bust the Crew

Is it wrong that I hope I caught a crew member double-dipping on another show? One of our set dressers turned in his start paperwork and it had a piece from another show in it. That show is on the same lot but I think they are using a different payroll company so it wouldn't get found that way. I'm waiting for the other payroll accountant to call me back and let me know. I really want to bust them.