Many Boxes, Many Rockses

Please read: This was my approach that worked for me. I shared the results from only two weeks worth with a set of 13 characters. My goal was to re-accumulate boxes with minimal effort, hence never climbing in the vaults or spending too long on a single character. I never intended for it to be a fast farm, but rather one I could continue to do weekly with relatively little time investment. Hope that clarifies expectations, happy hunting!

Since I am bitter that I vendored my original stockpile, and refuse to spend gold...

Here is my insight into farming [item=199216] via the Zskera vault.
Remember Zskera Vault Keys are now purchasable with Dragon Isles Supplies.
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When you walk down into the main room of the vault, the first door on the left has historically been a Box of Rocks container room [for me]. But the doors you actually want to open have a brown dirt cloud effect at their base. Save your key if you don't see said door on the first floor -or elsewhere if you've managed decided to climb.
There's usually a golem to kill first but the Box of Rocks container is sadly not a guarantee -in my successful rooms I have consistently looted (4-5) [item=199216]. *** To clarify, you have to find the Box of Rocks container somewhere in the room, it can be easy to miss.

One character, one key, once per week. Have more max level toons? Send keys to each of them and repeat. Obviously this is ideal for people who can utilize multiple characters.
Make sure to consume one before swapping so that it's on cooldown.

I sent 13 characters into the vault this week:

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• only (6) characters looted A Box of Rocks, of those one had (5) where the rest received (4) each.
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• all dirty doors existed on the first floor, half were first room on the left
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• (1) character had a dirty door with no Box of Rocks container
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• the vault layer(?) is irrelevant since my successful runs were a mix of old and new characters to the vault
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EDIT/UPDATE | results of my second [and final] week:

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• only (5) characters looted A Box of Rocks, of those three had (5) where two received (4) each.
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• all dirty doors STILL exist on the first floor, all but one were first room on the left
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• (1) character had a dirty door with no Box of Rocks container
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TLDR the math is mathing and I supplemented with the one-off finds in the Waking Shores

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Since a lot of my characters were fresh to the Forbidden Reach, here's a rough guide getting there:

1. 
   
2. Go to the dragon roof party in Valdrakken and talk to Kurazidaia /way #2112 61.0 26.6 Kurazidaia
   SKIP everything -talk to whatever NPC and skip until you no longer can, and you will eventually end up back at the Seat of the Aspects.
3. 
   
4. Now actually go to Morqut Village in the Forbidden reach and talk to Scalecommander Viridia /way #2151 34.6 57.6 Scalecommander Viridia
   to pick up the quest Helping Hand and Claw.
5. 
   
6. Once complete, go right back to Scalecommander Viridia who will now offer Exploring Our Past, this will actually send you to the Zskera Vault making it accessible.
7. 
   
8. After turning in Exploring Our Past to Pathfinder Jeb, grab his next quest to proceed inside.
   NOTE: The Keys You Need also becomes available from Pathfinder Tacha, which is worth for the few extra freebies.
9. 
   

Blizzard: Bags is not full, you keep too much trash on it, throw something out.

Also Blizzard; Remember that thing you deleted 2 years ago and used a lot but since it has no propourse you just deleted? If you have 50 of them now i give you an achievement.

When was this achievement added? I have completed the Zskara Vaults on all my 13 characters, when it came out in 10.0.7 and never saw this achievement. Sold or used all my boxes before this achivement was added so my progression is at 0. Feel a bit weird that they added an achivement to previous patch content, when people are done with these content..