Section VI. And be it further enacted by the authority aforesaid, That the auditor-general shall draw his warrant on the state treasurer for the amount or balance of all accounts settled agreeably to this act, which are in the nature of claims on the commonwealth, and for which there is an appropriation by law, and all accounts and vouchers, and other papers appurtenant thereto shall be filed in the office of the auditor-general, copies of which, or of books, or any other documents in said office under the hand and seal of the auditor-general, shall be admitted to be read in evidence in all courts of law and elsewhere in this commonwealth.