Title 12 USC §411 Federal reserve notes, to be issued at the discretion of the Board of Governors of the Federal Reserve System for the purpose of making advances to Federal reserve banks through the Federal reserve agents as hereinafter set forth and for no other purpose, are authorized. The said notes shall be obligations of the United States and shall be receivable by all national and member banks and Federal reserve banks and for all taxes, customs, and other public dues. They shall be redeemed in lawful money on demand at the Treasury Department of the United States, in the city of Washington, District of Columbia, or at any Federal Reserve bank.

Seems to me federal reserve notes are for use by Federal Reserve agents to make advances and for no other purpose. If your not a federal reserve agent then what does redeeming them in lawful money do? Shouldn't only federal reserve agents be able to redeem them?