Requests must be postmarked by January 14, 2010 and received by February 01, 2010. You must include your utility company and account number and they suggest attaching a copy of a past bill to ensure proper credit.
It will take around 6 to 8 weeks to receive credit.
For more information, go to http://www.kraftfoods.com/sitecollectionimages/imagerepository/7/tombstoneflyer.pdf