One of the biggest mysteries in GW1 for me was the existence of the two loot chests in Dreadnought's Drifts (there was also one in Ice Floe right outside Thunderhead Keep but Wiki seems to have no information on that one):
Few people knew about these chests and as soon as more people learned of them they got removed. What was special about these chests was not just the fact that no keys were needed to open them, but also that they seemed to be able to drop every weapon skin that was in the game at that point, ranging from weakest to max stats. I farmed the chest in Ice Floe alot and got a bunch of weird skins like Swamp Clubs, Dwarven Hammers/Axes and Crystalline Swords, but interestingly, the chest also dropped some ritualist foci before Factions was even released!
So what was up with these chests? Were they even supposed to exist in the first place? Were they designed and put in the game like that on purpose or were they bugged from the start?