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Old chests (caches) can be found in several hostile locations. You may need a group to get there! The single stage missions they offer count towards the Explorer Achievements.
Plateau (Sector 1)Edit
Missile Silo: 4673250 3950995
Northfields (Sector 2)Edit
Kaibab Forest (Sector 3)Edit
Brigg's Point Facility: 7061844 4746777
Earthbound Retreat: 6153985 4887227