The said commission, or a majority thereof, shall make a report, in writing, and attach thereto a map or draft showing the courses and distances of the line so ascertained and designated by them as the old county line between the said counties; or, where they shall have recommended a new county line, such map or draft, in lieu thereof, shall show the courses and distances of the line so recommended as a proper county line; and, in either case, said map or draft shall also show the land through which said line passes, and the buildings in close proximity thereto, together with the roads and streams crossed by or near to such line; and copies of such report and map, signed by the members of the commission or a majority of them, shall be filed in the court of quarter sessions of each of such counties, and, if approved by such courts, shall be ordered recorded in the records thereof; and the line so ascertained, surveyed or recommended, and so marked, shall thenceforth be the boundary line between such counties.