Each probation officer and each assistant and deputy probation officer receiving an official salary shall furnish a bond in the sum of not more than two thousand dollars ($2,000) and approved by the judge of the juvenile court, conditioned for the faithful discharge of the duties of his office. If such bonds, or any of them, are furnished by a surety company licensed to transact business in the state, the premium thereon shall be paid out of the county treasury. In the event the probation officer, assistants and deputies are included as covered employees in a master bond pursuant to Sections 1481 and 1481.1 of the Government Code, the individual bonds prescribed above shall not be required.