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To be able to open the Treasure Chests, you'll need the lockpick. There's a couple of steps you need to do and it's yours:
Do the Side Mission: Find Takiy's Dice At The Hidden City --> Mission Guide
In this mission, you have to talk to 5 Outcasts. The last one is a Merchant and will sell you the Lockpick and the Ascender.
After the mission, I also found her at the salt fields in the north.