2021 United States Mint Silver Proof Set 10-Coin Set with Reverse Proof Nickel. Pre-owned condition, minor wear on box. Light scratching on plastic cases. Questions & Office Hours. We are here to address your questions Monday through Friday until 2pm EST. Please send us a message and we will get back to you as soon as possible. We are not available on the weekends or holidays. However, from time to time situations will occur. Please give us the first opportunity to solve ANY AND ALL issues before leaving unfavorable feedback or initiating a case/claim. We are here to help. Please return items in their original condition.