There had been a couple of break ins within the time he has had an office here, all of which were quickly cleared up. None of the people that had been captured had an ulterior motive outside of business secrets. The other reassurance he had was that his secretaries and staff had more than enough benefits that they wouldn't take random risks.
Yes, some of them aimed for a higher seat and specifically the seat that was next to him. However, behaviour like that was easily caught and they would be blacklisted immediately from the corporation and any subsidiaries. There have been more than enough examples to scare any future attempts. Even without that extra motive, the benefits are higher than other secretaries in the industry. That belief and the strict surveillance they had on everyone is what has kept him and his secret room working perfectly.
