Treasure chest
A treasure chest is a recurring element in Dragon Quest games as well as most role-playing games. It appears in various locations throughout the games and often contains an item or gold which the player receives upon opening the chest. Beginning in Dragon Quest III some chests are traps which contain enemies such as a Cannibox, Mimic and Pandora's box. To counter this, the spell Peep, was created to determine whether a chest had treasure or an enemy due to it's glow.
Later installments added pots, cupboards, drawers, etc. with a similar function. Generally, treasure chests are used to distribute items throughout the locations in each game.