It probably came from one of these sweepstakes:Kraft - America's Grilling Champ Contest: Grand Prize (awarded to the "America's Grilling Champ" nominee): Weber Summit 450 LP gas grill, $10,000 cash, and one year's supply of Kraft Barbecue Sauce and A1 (ARV $13,100).
First Prizes (1,000; awarded to nominators): The first 1,000 valid entries will receive a copy of Weber's Big Book of Grilling (ARV $22.95).or the Family Circle - Grill Book Giveaway Sweepstakes: Prizes (25): Copy of Weber's Charcoal Grilling: The Art of Cooking With Live Fire by Jamie Purviance and Tim Turner (ARV $20).
If it's not one of these then good luck trying to find out which one and congrats on your win.