Can anyone please give me tip on how to get more of these? Seems like they are not dropping from mobs 20+ and finding chest that is not already looted with a stick of bread left inside is next to impossible.
Low level seems very popular while higher level are more rare/random. I farmed a lot of murlocs for the pearls and I got only few boxes from them. On lower level they are much more common from mobs drops and from chests - and people low on rep go through starting zone and loot chests to get them.
Do lower level mobs up until friendly.
From friendly onwards my strategy was to go to Wetlands and farm gnolls on the eastern part of the zone. Fast respawn, lvl 22-25 and not overcrowded like all the other zones are currently. Like Redrige Mountains.
Be warned tho, I had an average of 1 supply crate every 1-1,5 hr including travel time back-and-forth to IF. I did kill mobs on the way to that location everytime.
Crates in Wetlands are not easy to come by as they often are located in camps with 6+ mobs (not to mention ppl running by and ninja when you are fighting).
Duskwood can also be a decent place that is not too crowded, but some mobs there are below lvl 20 and wont work when friendly with the faction.
Good luck!
(this low drop rate and limited to 1 in inventory is not a good gameplay experience at all - but classic is classic, and the grind is real)
On Alliance enter the cave in redridge 20,29 where you farm rethban ore with the gnolls, and camp the platform with the gnoll camp where the chest spawns. Repeat.