For the PP who asked where to find the codes, if you get a 12 pack, one of the ends is perforated. If you tear off that flap, the code is under there. On the 24 packs, there is also a perforated flap on the top of the box. The code is on there as well.
Do they seriously mail the coupons? It says it can take several weeks. I thought it would just be something to print off, like my King's Island voucher was.