By A Mystery Man Writer
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
Larran's small chest - OSRS Wiki
Rantz's cave - OSRS Wiki posters for sale
Monumental chest - OSRS Wiki
Chest (Tombs of Amascut) - OSRS Wiki
Upstairs of the building in The Node is a chest that's the same asset as the chest in Pirate's Treasure, and the key from the quest can be used on it to get the pirate message. Thought this was mildly interesting. : r/2007scape
From the new OSRS Wiki TOA Calculator, these are the solo drop rates for different raid levels (no deaths) : r/2007scape
Barrows, Old School RuneScape Wiki
Elven Crystal Chest - OSRS Wiki
Gold Chest (red) - OSRS Wiki
OSRS Complete Slayer Guide Fastest Way to 99 Slayer - OSRS Guide
New Barrows rewards calculator and mechanics on OSRS Wiki — calculate the expected value of any Barrows chest : r/2007scape
Exploring Osrs Wiki on Craiyon
Magical Chest - OSRS Wiki
Larran's small chest - OSRS Wiki