[Plugin: DRP Coupon] Show Message – Expired Date

Makes no sense what you are saying.

I would need to see your site and a screenshot of your settings

I have checked and I can assure you that when the expiry date arrives, the message you have selected will show AS long as you have NOT checked the box to exclude that message ( the box which you check to exclude is located when you go to a post or page and click the coupon button to add the coupon. It asks you do you wish to exclude ( name, description, coupon expiry date ) did you have that checked? if so uncheck it