That doesn't matter. They are obligated to investigate each and every phone call to their fullest extent. Only if the same person called repeatedly could they even begin to think about the "boy who cried wolf" excuse.
Sure, I just mean to say that a person calling the urgent line because someone may have accidentally pocketed a key and the homeowner is concerned, is reasonable. That should be investigated.
But the guy calling with a police report on his entire place being completely trashed? The calls for the support staff to have a Bat-Phone to someone at a very high level, if not the top.