If you lose an item of property, apart from making the obvious search of the area where you might have lost it, check with the Secondary School Office in the Vieille Maison and in the Lost and Found office (located in the basement of the Grand Batiment). Your chances of retrieving a lost item are obviously greatly increased if it is clearly marked with your name.
To access the Lost and Found room, please go to the main reception and ask someone in the office to open the door for you.