Section 9

Such award shall be filed in the Land Office and shall, except as hereinafter provided, be final and conclusive evidence as between the Land Officer and the persons in-terested, whether they have respectively appeared before the Land Officer or not, of the true area and value of the land and the apportionment of the compensation among the persons interested.

The Land Officer shall serve a copy of his award on all persons intefested, provided that their addresses can be ascertained after reasonable inquiry when the award is made.