The first thing to be clear about is that there are a total of 22 locked treasure chests in the game and you can get a treasure chest key by completing the level 3 side story of One Piece Odyssey Grand Line Quiz.
This is all you need to know about where to find the treasure chest key in One Piece Odyssey, so now that we're done, we hope you can reap a lot of benefits from these chests.
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