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A Chest Key is a recurring item that can be exclusively used to open Chests to retrieve the item inside. They have various amounts of uses in different games of the Fire Emblem series. They can be used in substitute of Thieves.
In Fire Emblem: Awakening, anyone with the Locktouch skill can open chests without a chest key. Anna and Gaius come with this skill, although anyone that can become a thief with a Second Seal can learn it.