North Island: Northview Gas
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5 - Letter #1: Sato’s Letter
Map Coordinates: X:435.2 Y:654.6
For this letter, go to the map marker and it will lead you to a Mountain gun on a platform on the side of a cliff. Look in front of the gun and you will find the body lying there. Watch out for the tigers!
6 - Letter #6: Mogi’s Second Letter
Map Coordinates: X: 600.7 Y: 620.8
For this letter, it’s rather easily found inside a small bunker along the beach.