Every employer who has secured compensation under the provisions of this chapter shall keep notices posted in a conspicuous place or places in and about his place or places of business, in accordance with a form prescribed by the commission, stating that such employer has secured the payment of compensation in accordance with the provisions of this chapter. Such notices shall contain the name and address of the carrier, if any, with whom the employer has secured payment of the compensation and the date of the expiration of the policy.