Congratulations on completing a very difficult set!
It might be of interest that on Dec 7, 1922 30,000 new haves were transferred from SF to St. Louis, 50,000 new halves from Denver to Boston, and 100,000 new halves from Denver to New York. With no new halves made in 1922 it is likely these coins were either 1920 or 1921 date pieces. If dated 1921 it means that Denver transferred 2/3 of its total mintage to Boston and NYC -- where they almost certainly entered holiday circulation. [RG50 E-89A Vol 1. "Transfers of gold, silver and minor coins."
Here's the Denver Cashier's statement showing the transfers ($75,000). I don't have the SF statements.