When Claymore opens the strongbox, the $10 and $20 bills inside all have Federal Reserve letter codes of L, which refers to the San Francisco Federal Reserve Bank. In 1968, it is not likely for that many bills from different denominations to be L notes. They would most likely be A notes from the Boston Federal Reserve Bank, which provides currency for New England. The San Francisco Bank would provide the notes for Los Angeles which is where the show was filmed.