They use the same key and locks to make it easy to access in case of emergencies. Firefighters and Police officers all have the same key. It opens up all sorts

They use the same key and locks to make it easy to access in case of emergencies. Firefighters and Police officers all have the same key. It opens up all sorts of boxes from elevators to lock boxes. Selling the key over the Internet to whomever can pay for it is asking for trouble. If they use different keys it will cost money to change all of the locks and issue everyone a new key.