The Chest of Heirlooms is a locked container obtained during the Treasures of Tokuno events. Classified as a Minor Tokuno Artifact, it contains items of varying value. Notably, if the chest is unlocked, it becomes ineligible for turn-in exchanges. Players can collect 10 Minor Tokuno Artifacts and exchange them with Ihara Soko, the Imperial Minister of Trade, for a Major Tokuno Artifact. The Chest of Heirlooms adds an element of surprise to the event, as its contents remain unknown until unlocked.