From your description it sounds like you're talking about the region chests (gold ones that are marked on the map until found). That is not what the quest is looking for you to loot. The faction chests are the randomly appearing and disappearing ones that are scattered across the map and do not appear on said map.
If these are the chest you are opening and the quest still does not progress, can you upload a clip of this occurring?
English
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That's very interesting! Step 2 had me searching for region chests, so I must have assumed the different chest types were the same in Step 3 when I saw the quest update on-screen. Definitely my mistake! When I come back to the game tonight I'm going to look some more for these other chests. Thank you so much for clearing that up.
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Happy to help