Small chests are found inside H.A.M. Storerooms during and after the Death to the Dorgeshuun quest. Depending on the room, the player may need to pick the lock on the door to get to the chests. To open these chests the player needs one of the following keys found by pickpocketing the H.A.M. guards down in store room

Small chest - OSRS Wiki

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Dark Chest - OSRS Wiki

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Larran's small chest - OSRS Wiki

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