Harb. & Nav. Code, § 3922

Upon the payment of any such bond or coupon, the State Treasurer, or such state fiscal agent, or agents, shall perforate the same with a suitable device in a manner to indicate such payment and a record of such payment shall be made thereof. The State Treasurer, or such state fiscal agent, or agents, shall also on the respective dates of maturity of any such bonds which have been executed but which remain unsold, cancel the same by perforation with a suitable device in a manner to indicate such cancellation and the date thereof, and on the respective due dates of all coupons attached to any such bond remaining unsold, shall detach all such coupons the due date of which has been reached, and cancel them in the same manner as provided for the cancellation of bonds remaining unsold. After proceedings set forth in Section 3907 new bonds conforming to the directions of the committee may be prepared and executed in lieu of any bonds so canceled, and may be sold and issued in the same manner as provided for other bonds in this part.