Survivalist's Cache
The Survivalist's Cache is found at [64.7, 25.7] on a cliff above Colossal's Fall just west of Magnarok in northeastern Frostfire Ridge. To access it, run to the north side of the Gate of the Breakers, where Broodmother Reeg'ak is found in her den. A good starting spot is [64.9, 32.0] on top of the path cave mouth. Run up the hill to the north-northwest, looking for the Rappelling Anchor at [64.1, 29.2] on a snow-covered ledge, with a non-active rope leading down to a small ledge. Jump down to the ledge and follow it to the northeast. At the very end of the ledge, nestled up against the cliff face, find the Survivalist's Cache between some small rocks. It contains 20-30 
[Garrison Resources].
Tracking quest
To check whether this chest has been looted, copy and paste this command into the chat window:
/run print(C_QuestLog.IsQuestFlaggedCompleted(33946))
If a "true" appears in the chat window, this chest has been looted; "false" indicates the opposite.
Patch changes
Patch 6.0.2 (2014-10-14): Added.