I’m glad you can carry at work. Many businesses do not allow firearms at work. I worked for the federal government and we couldn’t.
Having worked in a similar situation as you with a nut job, it is very unsettling. Stay safe.
Mine technically does not either but the employee handbook does not address it directly and concealed is concealed ;) And even if it did I would ignore it.
I carry every where I do not have to go through a metal detector.