The Copper Chest is a pre-Hardmode grab bag sold by the Gambler. It always contains money, and can also contain various vanity items, novelty items, or items that have useful functions.
Although statistically nearly impossible, getting the luckiest haul could grant 50 times greater than the purchase price, while the most unlucky haul could grant as little as 200 times less than the purchase price.
On average, each Chest will drop 7 70 in coins, making them not worth opening in large amounts for the coins alone.