The container is inside a little room in the camp.
The container is in the middle of the camp with view to the ark.
The container is on a construct in the middle of the camp. Look up from Storage 3 and you will see a metal arch. To get here, climb on the rocks from the entrance and jump onto the roof next to the arch. Then you can go up.
Storage 5 and 6:
The two containers are close to each other at a lookout on the other side of the camp. There is a path you can take close to the ark entrance.