(2) The official at the time of serving such notice shall also file with the officer or official occupying the position of secretary or clerk of the state, county, city, school district, drainage or irrigation district, board or commission, as the case may be, at the regular place of business of such secretary or clerk, a certified copy of such notice. At the expiration of 10 days from the filing of such notice, the surety or sureties upon such bond or undertaking shall be discharged from further liability thereon. [Formerly 747.140 and then 743.744]