2018 S Proof Set Original Box & COA 10 Coins 90% Silver. Description : This US Mint proof set includes all coins issued for the year. All coins are sealed in original Government hard plastic holder with box. We make every effort to make sure the packaging is acceptable, and all the coins are problem free. There may be some imperfections in packaging due to the sets leaving one collection to go into another as well as the age. Keep this in mind when you receive your sets.