The Silver Lockbox 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 32 times greater than the purchase price, while the most unlucky haul could grant as little as 313 times less than the purchase price.
On average, each Lockbox will drop 25 87 in coins, making them not worth opening in large amounts for the coins alone.
Out of the 4 grab bags, the Silver Lockbox gives the least amount of money in proportion to its cost.