Cal. Rev. & Tax. Code § 2507

The officer accepting negotiable paper may deposit it daily with a bank for collection and receive from the bank cashier’s checks in an amount equal to the total deposits. The cashier’s checks shall be deposited in the county treasury like cash received for the same purpose. The officer accepting negotiable paper may at his option deposit such negotiable paper daily in the county treasury instead of in a bank; and the county treasurer shall handle such negotiable paper like any other negotiable paper accepted by him.