It is a standard key that only the fire services and building management hold. That way, the plan isn't stolen or vandalised before it is actually needed.
I knew there would be this comment but didn't expect it so soon. From a fireservices user no less. You win this time.
Because Americans don't read but they do steal.
They're locked everywhere.
Actually not a terrible idea to keep the cabinet locked... Because the fire plan is just a sawed off shotgun and a bottle of Tangueray.