4 Total Chest, 7 Known spots so far. Thanks to u/xxwinnslowxx for spot 6, u/thebarneybot for spot 7, shadowlago95 for spot 8
The first treasure chest location is the riverside cabin below the autumn island of the island .
The second treasure chest is on the ground at the end of the left bank of the sub-island 1 . Sometimes it will also brush the ordinary resource box. It may take several boxes to find the treasure chest.
The third treasure chest is our clue to the broken bridge, the water below the broken bridge on the right side of the sub-island 1
The last treasure chest was opened at the G-point tent of the Deputy Island 3 .