O.C.G.A. § 46-3-140: Cancellation of evidences of indebtedness and interest coupons.

Unless otherwise directed by the authority, every evidence of indebtedness and interest coupon paid or otherwise retired shall forthwith be marked “canceled” and shall be delivered by the paying agent making payment thereof to the authority, whereupon the evidence of indebtedness or interest coupon shall be destroyed and a certificate of destruction shall be filed in the records of the authority.