From the Super Mario Wiki, the Mario encyclopedia
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A Surprise Box is an invisible treasure box in Super Mario RPG: Legend of the Seven Stars. Mario learns about Surprise Boxes from an old Toad living in the basement of the Mushroom Kingdom Item Shop. By jumping, Mario can discover the location of the invisible treasures. A friendly Chester in Monstro Town provides Mario the number of Surprise Boxes to be found in the game. Later in the game, Mario can collect and equip an Accessory from Croco, the Signal Ring, which makes a noise whenever he is in an area or room with a Surprise Box.