The said Commissioners, or any Assistant Commissioner specially appointed by them, in Cases of Appeal to. a Jury on Questions of Boundary, may, if they or he shall see fit, order the Production of any Terriers, Maps, Plans, and Surveys, or Copies thereof, touching the Matter in question; and all Costs, Charges, and Expenses properly incurred by the said Commissioners and Assistant Commissioner, or by the Valuer, or any other Person or Persons, in supporting the Award and Decision of the said Commissioners or of the Assistant Commissioner, and incidental thereto, including the Costs, Charges, and Expenses of producing, and of the making or procuring and producing Office or other Copies or Extracts of Maps, Surveys, or other Documents, shall be included in the Costs of such Appeal, and be payable and recoverable in like Manner as if the same were Expenses of Witnesses under the firstly herein-before recited Act.