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The Rugged Document Pouch from the Dragonguard chest gives opened maps
This container drops from the Dragonguard chest in Tideholm:

This container has a chance of dropping treasure maps. After Update 49, this container continues to drop maps directly (i.e.,
not the new "Unopened Treasure Map"). The following screenshot was from a document pouch that I acquired today:

It should be dropping the new Unopened Treasure Map, but it's not.
Nightfighters ― PC/NA and PC/EU
Dungeons and Trials:
Personal best scores:
- Dragonstar Arena: 46817 (NA)
- Maelstrom Arena: 600526 (NA)
- Blackrose Prison: 99274 (EU) (Unchained)
- Maw of Lorkhaj: 165227 (EU)
- Halls of Fabrication: 220708 (NA) (Tick-Tock Tormentor #1, #2, #3, #4, #5, #6, #7, #8, #9, #10, #11, #12)
- Asylum Sanctorium: 114957 (NA) (Immortal Redeemer #1, #2, #3, #4, #5, #6, #7, #8, #9, #10)
- Cloudrest: 131256 (NA) (Gryphon Heart #1, #2, #3, #4, #5, #6, #7)
- Sunspire: 250866 (EU) (Godslayer #1, #2, #3, #4, #5, #6, #7)
- Kyne's Aegis: 235841 (EU) (Dawnbringer #1, #2, #3, #4, #5, #6, #7, #8)
Dungeon trifectas: