Simply put: No.   We have checks in place upon submission to ensure that a code can only be claimed within the bounds of the campaign range.   This is good for you, because that way YOUR risk as a manager is limited. That way you know once the promotion date has ended (eg: the coupon “has expired”), there is no possible way for a new customer to come along and try to claim and unclaimed prize.   The customer will simply get a brief message letting them know that the promotion is not currently running, and your contact information will be presented to them so they can contact you directly for more questions.