Sealed Monster Boxes are an effective way of obtaining large amounts of Silver with just one purchase, as each Monster Box contains 500 oz of .999 fine Silver. Each box comes sealed from the U.S. Mint, ensuring the coins have not been searched or sorted. The U.S. Mint does not sell its bullion coins directly to the public. Instead, they distribute their coins to only a handful of authorised purchasers who then sell the coins to the public.