Prior to November first of each year, the secretary of transportation shall furnish the secretary of corrections complete and detailed specifications, with an estimate of the number required, for the manufacture of all highway markers or signs to be delivered during the ensuing year for use the following year. The secretary of corrections shall cause the same to be manufactured on the basis of said specifications and estimate and shall cause the same to be packed in suitable containers and shipped, prepaid, to the designated destination as they are finished, which shall not be later than December fifteenth of the year of manufacture: Provided, That all additional orders for extra markers or signs and “miss-outs” shall be manufactured and shipped as soon as convenient after the order is received. Annually, on June 1, the secretary of corrections shall file a verified statement with the secretary of transportation showing the total number of highway markers and signs manufactured and delivered during the preceding twelve (12) months.