While exploring the Island of Waford in One Piece Odyssey, you’re bound to find loads of treasures along the way. One such category of treasure is the Locked Chest which contains resources vital to your survival on the island provided you have a chest key to open them with. Below is a guide on where you can find the locked chests in Water Seven. Opening all of them rewards you with the Treasure Hunter trophy/achievement. Please note that you will have to complete the Grand Line Quiz questline in order to receive the key needed to open the chests. You can find details on those quests here.
Dock One
Material Depot
This chest can be found under the southeastern shed in the depot. You’ll need to use the crane hook on the western side to reach it.
Sewer
Old Sewer
This chest can be found in a room through a hole in the wall guarded by a giant bat in the southwestern part of the area.
Old Sewer
The chest can be found near the end of the sewer.
Water Seven City Area
Cafe Park
This chest can be found behind a set of stairs under an overhang on a building.