When it is desired by the board of directors, or other interested party entitled to sue, to file such bill, the county trustee, upon request, shall make out a statement or list, showing all the lands upon which such assessments are so delinquent, and the names of the owners thereof, as appear upon the drainage assessment book or showing any tract or tracts assessed to unknown owners, if such is the case, and certify as trustee to the correctness of such statement or list as it appears upon the book, and in such chancery suit the certified statement or list shall be prima facie proof of the facts so certified to and that such assessments are delinquent, and sufficient proof to authorize a decree of sale in the absence of rebutting proof of the facts shown by the certified statement.