There are two types of treasure boxes in dungeons. The golden treasure chest that can be opened before the meat and the environmental protection treasure chest that can be opened after the flower of the century (after defeating the flower of the century). The golden box needs to defeat the skeleton queen, smash the black mud in the dungeon (the key must be dropped) or brush the mobsters to lose the key. A key can open a golden treasure chest with the exclusive weapons and equipment of the dungeon. After the environmental treasure chest needs to defeat the flower of the century, brush the monster in the corresponding environment to get the key. For example, you have to open the jungle treasure chest, defeat the flower of the century and brush all kinds of monsters in the jungle and underground. They all have a chance to lose the key to the jungle treasure box, but the probability is not high. Wiki says 1/2500.