I ordered 11 1964 mint sets. I received 10 1964 mint sets and one 1968 mint set. Apmex did send me instructions as to how I could return the 1968 mint set and receive the 1964 mint set as ordered. The procedure I had to follow involved multiple steps including specific return instructions and returning it in person to the post office. I was told to monitor the return process daily. Their instructions would have required several hours of work on my part. I found this not to be worth my time and so Apmex did not fix their mistake.