The Treasure Chest is a microtransaction system featured in Battlefield Heroes. Treasure Chests were formerly bought for 999, but were changed to be obtained randomly by damaging enemy players in games, and can be opened by the use of Treasure Chest Keys. Treasure Chests are functionally identical to supply drops. The contents of the Treasure Chest change over time, unlike other supply drops, and contain weapons, widgets, and cosmetics. Keys are purchased for 499 each, and can be purchased in bundles of 10 keys, 25 keys and 50 keys. Keys were also able to be earned via promotions or obtained through redeemable codes, The Claw and Deal of the Day. Each chest and key is unique for the character they are purchased for, with a maximum of 10 chests able to be held at any one point by a given character.
The Treasure Chest system was in development for years and was inspired by an unnamed game's similar system, as told by the developer HATE on the forums.
Since its release, the Treasure Chest and the keys has been subject to a number of bugs overcharging players, resulting in refunds.
Two early bugs resulted in the keys costing 999, and obtaining the Drayseen the Dragon or Godor the Dragon cosmetics would charge an extra 899 when being obtained. Another bug resulted in players who obtained the Goddard's Goon and Rufin's Ruffian from the chests being charged 999.