If the key is not lost in the dormitory, it must be lost in the office or corridor or on the street, and because the door locked with it when opening the dormitory,. If I lost it in the office or corridor, there will be a lost property notice. I haven't seen the notice now. ['Lost the keys in the dormitory.', 'Lost the keys in the office.', 'Throwing keys in the hallway.', 'The keys were lost on the street.']