The county auditor who certifies the sufficiency of the petition shall notify the person or persons who submitted the petition of its sufficiency or insufficiency within five days of when the determination of sufficiency or insufficiency is made. Notice shall be by certified mail and additionally may be made by telephone. If a boundary review board exists in the county or counties in which the proposed fire protection district is located and the petition has been certified as being sufficient, the petitioners shall file notice of the proposed incorporation with the boundary review board or boards.