have you done this? I am in the process of sending the coupon from passed bills to comcast trying to get a check back from them. And i am sending the coupon for the current to discharge the debt. i will let you know how it works. I have wrote on the front of the past coupons "Redeeming coupon for lawful money of The United States of America" and also on the front "This is not a check". I wrote this is not a check because as i understand the UCC code the coupon also seems to fit the criteria for a check and i don't fell like getting a check fraud charge of any kind. After reading what you posted I am also going to endorse the back