The comptroller may require from the state highway commissioner, the custodian or other approval officer, or any or all of them, such further satisfactory proof as to the proper disbursement of the fund and its maintenance as he may in his judgment require, and may withhold the warrant for the replenishing of the fund until such proof is forthcoming, but in that event the salaries and wages of the officers and employees of the commissioner shall be paid by the state treasurer upon the warrant of the comptroller after approval of the civil service commission until such time as the cause for withholding the warrant shall have been removed.