The Department of General Services may examine all records, files, documents, accounts, and all financial affairs of every agency mentioned in Section 14618. It may enter any public office or institution in this state and examine any records, files, books, papers or documents contained therein or belonging thereto for the purpose of making such examination. Every state agency shall permit such examination and upon demand shall produce without unnecessary delay all books, contracts, and papers in its offices, and furnish information touching books, papers, contracts, and other matters pertaining to the agency.