Apparently Campos was entered into the Mandalay Bay hotel computer system shortly before the shootings, by the CEO himself, and his file contains not one snippet of info (phone number etc). In a video I forced myself to watch part of, link available on request. Photos of the MB computer pages on the video.
Where did the story about the CEO adding Campos come from?
I find that almost impossible to believe. CEOs generally do not touch electronic accounting or personnel records. That is part of any good system of internal controls.
The other reason is that CEOs are simply too busy to become proficient with the relevant software.