I mean, would it be possible to just have a DM or admin run through those caves at the current server's live session? - BEFORE it resets.
You likely will find two masks missing where you would expect to find them.
The 500g masks.
And use teleporting to get back to the board ASAP preventing area reset/mask respawn.
Like I just found undeniable evidence its broken.
3 of the 500g masks on the board.
I zoom over to the bear cave and enter Area (2) where masks are KNOWN to spawn, therefore it is one of the 3 locations you imply they spawn.
Given I zoom over in 2 minutes, if someone picks it up, there is still a 13 minute window to get there.
When I entered Area 2, there were NO loot nodes available. Completely empty map except for herbs and bats.
I enter Area 1(known to spawn a mask) and search, find nothing.
I zoom back through Area 1 and 2 (preventing reset) and check the board which takes about 2 minutes to get back.
Still all 3 masks listed.
Given 3 masks spawn, Area 1 and Area 2 should have by default one mask, but they did not.
And this is under the assumption from what you said, the 3 500g masks, spawn in one of three areas.
I strongly encourage any naysayers to provide counter evidence by running through the caves and finding more than 1 mask in a single search of all the areas, as of the current live session.
Once a reset occurs, this will not be the case for a while.
EDIT: Server has reset so will update this thread the next time I ever get around to checking the masks.