Whenever the bond of any school treasurer, approved by the trustees of schools or school board as required by law, is filed with the regional superintendent of schools, he shall carefully examine it, and if it is found to be in all respects according to law, and the sureties sufficient, he shall endorse his approval thereon, and file it with the papers of his office; but if the bond is in any respect defective, or if the penalty is or sureties are insufficient, he shall return it for correction. When the bond has been received and filed, the superintendent shall, on demand, deliver to the school treasurer a written statement certifying that his bond has been approved and filed and that the school treasurer is entitled to the care and custody, on demand, of all moneys and securities belonging to the township or district for which he is treasurer and all books and papers pertaining to his office. The regional superintendent of schools shall file with the State Board of Education before September 1 in each year an affidavit showing which treasurers of school districts under his supervision and control are properly bonded.