Assassins Creed 3 Chest Keys guide will take you through all the different regions to unlock them.
Assassins Creed 3 Chest Keys are located in different regions of the game. Some will be located in the Boston area, Frontier, New York. You will need located the key, once you locate the key you will be able to open the chests with the key. Now one key point is all chests located in the corresponding region opens the chest, if you can open the chests then you will nee to pick the lock to open it. Here is what you need to do to find them and to unlock the different keys in the game. See below the chart for all the keys location that you will need to locate to open the treasure chests.
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Frontier – Sequence 5
Boston Central – Complete Memory 2, in sequence 6
Boston North – Complete the Boston Central Liberation Mission
Boston South – Complete Boston South Liberation mission
New York North – Complete New York North Liberation Mission
New York East- Complete New York East Liberation Mission
New York West – Complete New York West Liberation Mission
Finding the treasures and chests keys go together and you will need to find both to be able to complete liberation mission.