I would imagine that one could make a list of FRN serial numbers and face values in a document and write something like
Could get it notarized perhaps even and send it off to the appropriate government fiduciary. You could stamp them and mark them with the number of your Redemption Certificate. EZrhythm might have mentioned something like this earlier in the thread.Redemption Certificate # 1234
Bills : Federal Reserve Note serial # A 12345678 having a Face Value of $20; Federal Reserve Note bearing serial # ...... having a Face Value of $100; ....
Pursuant to 12 USC 241, ...., by special visitation do hereby redeem each of the said Bills, Federal Reserve Notes or clearinghouse certificates for lawful money.