Periodically you may want to delete one time use coupons that have been redeemed, as these are not automatically deleted.
1. In the ShopSite backoffice, go to: Merchandising -> Coupons
2. Choose 'One Time' from the first dropdown, and choose is 'greater than' from the second dropdown, and enter the number "1" in the search textbox and click "Search". This will list all one time use coupons that have been used already. You can highlight as many used coupons as you want and click "Delete" to delete them.