Is anyone doing the Lean Cuisine Free Lunch Bag promotion? (enter 20 codes from Lean Cuisine boxes by March 31 on their website -- get a free lunch bag) If so, where do you find the codes? I bought some Lean Cuisine today, opened the box carefully, but see nothing. The website says a red code will be printed inside each box, even if it doesn't advertise "lunch bag" on the outside. Anyone who has found one, is it on the flap or the box? Big or small? Thanks for any help!