Treasure Chest

Treasure chests are loot boxes that can be opened in various ways, depending on the chest. Each chest contains different rewards. Rewards may include food, gold, weapons, armor, or magic.

They are also called "chests".

Gold Treasure Chest
Gold treasure chests are the most common type of treasure chest. They are opened by using keys rewarded at the end of battles or found when you use Dig. These chests usually contain food, gold, weapons, armor, or magic

Below is a table of all gold treasure chests' locations and rewards.