California Code, Streets and Highways Code - SHC § 8672

The treasurer or the designated paying agent shall keep a register in his or her office showing the series, number, date, amount, rate of interest, and last known holder of each bond, and the number and amount of each interest coupon paid. The treasurer or agent shall cancel and file each bond and coupon which he or she pays.The register, canceled bonds, and coupons shall be retained for five years beyond the last maturity of the bond issue.