We have 2 keys to each room. All room keys unlock the front door to the residence hall. This system works well for us. We have card readers at all exterior entrances. Conference participants each receive a card that accesses all buildings assigned to their group.
Conferences uses the same room key system as the residential staff.
If a key is lost, the lock is changed and new keys are issued. We dispose of any old keys. May. All keyboxes are located within the residence halls. Conferences rehooks the keys in August before students return. If a key is lost or not returned by a participant, we charge the group to rekey the room, being careful to replace the single key remaining on the hook in the keybox as well as the keys kept by Conferences.