Tommy_The_Gun wrote: »It has some kind of hidden cooldown.
If you will get one box from World Boss and immediately go to nearest delve and kill a delve boss you wont get a box cuz there is a hidden timer that prevents you from getting another box too fast. Same in Public dungeon if you will go from one boss to another & kill them too fast.
I think the rule set here is same as with Plunder Skulls during Halloween event. Those also have like 3 or 5 minute cool-down.
I was double confused too as I thought you will get Gold box from each type of boss and every 2nd attempt would give you purple box. And on top of that I was also confused when I was not getting boxes at all.