Gold Treasure Box
From the Super Mario Wiki
The Gold Treasure Box, originally known as the magic treasure box, is an object in Super Mario RPG: Legend of the Seven Stars. It is a treasure box created by Magikoopa after Mario and his party defeat the brainwashed version of him near the end of Bowser's Keep. This particular treasure box has a gold color and has an infinite supply of coins in it for Mario to use.
The Gold Treasure Box reappears in Super Mario Galaxy in the Bigmouth Galaxy. Instead of containing coins, it contains Captain Toad, who will give Mario a Power Star. However, the only way to open this treasure chest is to throw a Gold Shell at it to break the lock.
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