Hi Croghanites,
Treasure keys have a [i]chance [/i]of dropping from the two smaller chests in the PoE treasure room.
Be sure you have a key in your inventory prior to entering the treasure room, otherwise the center chest cannot be looted.
Hope this helps
English
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Thank you! I was fairly certain I saw footage of people receiving keys prior to opening the airlock, after finishing the boss round; but it may have been pre-release footage. Thanks again!
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You're welcome :)