Each messenger and each assistant messenger under the supervision of the messenger shall: (1) Guard and safely keep all exhibits committed to his charge by the presiding judge, counsel or court officers, (2) obtain and attend to the proper return of such books, records, documents, files and works of reference, belonging in the office of the clerk of the court or in any state law library, as may be required in the court upon which he is in attendance, and (3) perform such other duties as the judges or the presiding judge prescribes.