Ala. Code § 36-17-12: Custodian of State Bonds, Etc., Redeemed; Registry of Paid Bonds.

The Treasurer is the custodian of all redeemed bonds and paid coupons of the state which must be cancelled. He must register them in a book kept for that purpose, in such manner as to show a full and complete identification by date, number, amount, rate of interest, time and place of payment and by whom issued, and such registry must be carefully preserved. All bonds of the state redeemed or paid must be cancelled and filed in the office of the Treasurer.