Open the coupon; below the form is the Checkouts Used panel. Set Begin date and End date (by default the last week up to today) and click Search. The table lists each order that used the coupon with: Creation (order date/time), Order (link to the order), User (link to the customer), Total Sale, Total Gross (subtotal before discounts) and Lifetime Value (that customer's total paid minus refunds across all orders). Orders paid later/down-payment are not recorded against the coupon, since the coupon-to-checkout link is only saved when the order is paid now.