In order that the aforesaid accounts may be thoroughly and properly audited, it shall be the duty of all boards of school directors and their proper officers, school depositories, district superintendents, treasurers of directors' associations, treasurers of teachers' retirement funds, and other proper persons, to furnish to such auditors, whenever required by them for auditing purposes, statements and accounts of all finances of the district, of teachers' institutes or directors' associations, and other funds belonging to or controlled by the district, including assets and liabilities, together with access to all books, records, tax duplicates, vouchers, school orders, payrolls, letters, and other matters pertaining to the same.