17 Years of Silver Proof Sets. 211 Proof Coins in the Sets.Nice Boxes, COA and Coins. The item "1999-2015 S Proof Sets Box & COA 90% Silver US Mint Silver Sets" is in sale since Saturday, April 09, 2016. This item is in the category "Coins & Paper Money\Coins\ US\Proof Sets". The seller is "simmlar" and is located in Providence Forge, Virginia. This item can be shipped to United States.