2021 S Proof Set Original Box & COA 7 Coins 99.9% Silver. US Mint Silver Proof Set. Original Box in Nice Shape. Similar to Set Shown. Up to 10% off BIN Price. Less than that will be auto declined. To combine more items you can take up to 7 days to pay. Please Allow up to 30 Days for Late Packages. 30 Day Return Privilege.