An empty tin is used in Recruitment Drive during the Miss Cheevers challenge. It is one of the 9 stages of tins used during the quest. The empty tin is picked up from a shelf in the room, and should be filled with gypsum to create the tin (gypsum). The tins are then used to create a plaster cast for the bronze key needed to complete the challenge. Using the wrong ingredients can result in a useless tin (strange).