The holder of any such bonds shall not be obligated to inquire into the validity of the claims funded, but shall be entitled to rely upon the proceedings taken pursuant to the provisions of this Division with respect thereto as establishing the validity of the items funded and the power to issue such bonds. The adoption of the resolution, which declares the intention of the county board to issue funding bonds under the provisions of this Division, shall be deemed a validation of the claims therein set forth insofar as there may be any question as to the legality of any or all of the same.