Prior to certifying the election, the county auditor shall exercise due diligence to confirm that all returned ballots have been received, processed, and reconciled, and that no ballots have been untabulated erroneously. Due diligence may include:

(1) Rechecking all ballot deposit sites; and

(2) Rechecking ballot storage containers in the ballot processing area, ballot tabulation area, canvassing board area, and vault.