The commissioner shall adopt an official seal. Copies of any act, rule, regulation, order or decision made by him and of any paper or papers filed in any office maintained by him, may be authenticated under said seal and when so authenticated shall be evidenced in all courts of this state of the same weight and force as the originals thereof. For authenticating any such copy he shall receive such fees as are fixed by him, commensurate with the reasonable cost of the services rendered, to be accounted for by him as in case of license fees, as hereinbefore provided. All records and files of the department shall be open for inspection, pursuant to rules and regulations.

The commissioner may certify under said seal any facts concerning the records and files of the department and said certificates shall be received as evidence in all courts of this state to prove the facts contained therein. The commissioner may certify under said seal any findings with respect to the physical properties, nature, flavor, specific gravity, purity, ingredients, proof and alcoholic content of any alcoholic beverage and that such findings are in an analysis made by a graduate chemist regularly employed by the department of alcoholic beverage control and said certificate shall be received as evidence to prove the facts contained therein.