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Treasure Boxes (Japanese: たからばこTreasure Box) are items in the Pokémon Mystery Dungeon series, that first appeared in Explorers of Time and Explorers of Darkness. They can be dropped from defeated Pokémon—assuming they are not already carrying an item—or found on the floor. The contents of boxes are predetermined upon obtaining them, and not determined at the moment of opening.
In Explorers of Time, Darkness, and Explorers of Sky, Treasure Boxes start appearing once the members for the Fogbound Lake expedition are announced in Chapter 6, even in dungeons visited before this point, and can be opened at Xatu Appraisal located in Treasure Town for 150 . At the end of certain dungeons, the player is guaranteed to find one-to-six Deluxe Boxes that can contain rare items such as stat boosters or high-rarity exclusive items depending on the dungeon. The boxes dropped by enemies have random contents: usually a ☆ exclusive item (if the enemy's evolutionary line has one, it is likely to be chosen), sometimes instead a reward for a normal mission for that specific dungeon floor. The specific odds of a Treasure Box and whether it will contain an exclusive item or not is species-specific. Enemies will never drop a Treasure Box during a Special Episode or in Star Cave.
In Explorers of Sky, Secret Stairs found in postgame dungeons can lead to Secret Rooms with Treasure Boxes; these however have dungeon-specific item pools shared with the Grab Bags that can be bought inside Secret Bazaars from Swalot.
In the Pokémon Mystery Dungeon games for WiiWare, Treasure Boxes are unlocked at the Gastrodon Judgment House after reaching second rank and can appear across all versions linked to the save file in any dungeon.
In Pokémon Mystery Dungeon: Gates to Infinity, the boxes can be opened by Rampardos Box Buster for 150 . Unlike in previous games, Gummis do not exist and Max Elixirs are often obtained instead, although it is still possible to find other items such as held items, and Gold Bars in amounts from one to five. Treasure Boxes can also contain Team Skills. The Team Skill, Collector, enables the player to find more Treasure Boxes from defeated enemies. There is a 15 floor DLC Map named Skill Treasury that enables more boxes to be dropped by defeated Pokémon as well. Boxes can also be found in chambers that require Keys and/or a specific Pokémon type to enter. These chambers can be found with Upgrade 2 of the Detour Guide. Upgrade 3 of the Detour Guide also sells the keys required to enter these chambers for 1650 . These keys can also be bought by exchanging 5 Gold Bars at Glorious Gold in Post Town. Treasure Boxes are stored in a space separate from items in the Deposit Box.
In Pokémon Super Mystery Dungeon, the boxes can be opened at Rockin' Lock in Lively Town. Blue-colored boxes are the most common and can be opened for 150 while the rarer red-colored boxes can be opened for 300 . Like the previous game, Treasure Boxes are stored in their own space in the Deposit Box.
A box that is dainty and fashionable. It likely contains something but won't give up its secrets easily. Take it to Xatu in Treasure Town for appraisal.
A box that is extravagant and opulent. It likely contains something but won't give up its secrets easily. Take it to Xatu in Treasure Town for appraisal.
A box that glitters with dazzling light. It likely contains something but won't give up its secrets easily. Take it to Xatu in Treasure Town for appraisal.
A box that's beautiful beyond measure. It likely contains something but won't give up its secrets easily. Take it to Xatu in Treasure Town for appraisal.
A box that is completely impressive. It likely contains something but won't give up its secrets easily. Take it to Xatu in Treasure Town for appraisal.
A box that is suspiciously sinister. It likely contains something but won't give up its secrets easily. Take it to Xatu in Treasure Town for appraisal.
. At the end of certain dungeons, the player is guaranteed to find one-to-six Deluxe Boxes that can contain rare items such as stat boosters or high-rarity exclusive items depending on the dungeon. The boxes dropped by enemies have random contents: usually a ☆ exclusive item (if the enemy's evolutionary line has one, it is likely to be chosen), sometimes instead a reward for a normal mission for that specific dungeon floor. The specific odds of a Treasure Box and whether it will contain an exclusive item or not is species-specific. Enemies will never drop a Treasure Box during a Special Episode or in Star Cave.
. Unlike in previous games, Gummis do not exist and Max Elixirs are often obtained instead, although it is still possible to find other items such as held items, and Gold Bars in amounts from one to five. Treasure Boxes can also contain Team Skills. The Team Skill, Collector, enables the player to find more Treasure Boxes from defeated enemies. There is a 15 floor DLC Map named Skill Treasury that enables more boxes to be dropped by defeated Pokémon as well. Boxes can also be found in chambers that require Keys and/or a specific Pokémon type to enter. These chambers can be found with Upgrade 2 of the Detour Guide. Upgrade 3 of the Detour Guide also sells the keys required to enter these chambers for 1650 
while the rarer red-colored boxes can be opened for 300 
Treasure Box artwork from Explorers of Time and Darkness
Treasure Box artwork from Super Mystery Dungeon
Pretty Box artwork from Rescue Team DX
Deluxe Box artwork from Rescue Team DX
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