Not sure if this is the case for you guys, but if you guys used a yahoo mail account and didn't see you coupoln yet,
my coupon was delived, but sorted by Yahoo as a spam and showed up in my Bulk Mail box. It was hidden in the 50+ junk mails, and if my friend didn't tell me that his coupon was found in the bulk mail box, I would've empty the box like I usually do every couple days (I get 30+ junk mail each day, and usually don't scan through them). Anyways, better check your bulk mail box to make sure.