It shall also be the duty of the said commissioners to make a detailed report of their operations, which, together with the field notes of surveys, description of monuments, maps and other items of interest connected with their work, shall be filed immediately after the performance of the duties imposed by this act, with the secretary of internal affairs, who shall cause a proper record of the same to be made, and shall place the same among other papers and documents relating to the boundary lines and boundary line monuments; that for the purpose of providing for the compensation of the said commissioners and for defraying other necessary expenses incident to the discharge of the duties herein imposed, the sum of two thousand dollars, or so much thereof as may be necessary, is hereby appropriated out of any money in the treasury not otherwise appropriated, which sum shall be paid on warrant of the auditor general to the secretary of internal affairs, who shall, before disbursing the same, require the presentation of properly verified and authenticated vouchers: Provided, That the compensation of said commissioners shall be determined by the governor, auditor general and secretary of internal affairs.