Sooner Heisman Mystery Box Featuring Autographed Baker Mayfield Framed Photo! Each Mystery Box includes one framed 15x17 Oklahoma Sooners' collectible item. (Retail value: $100) How It Works: Only 20 Mystery Boxes are available. Once all 20 boxes are sold, each participant will receive their guaranteed framed 15x17 collectible item. Bonus Gift: As a grand surprise, 1 lucky participant will also be gifted an autographed Baker Mayfield Framed Photo once all boxes are claimed. Every fan is guaranteed one framed 15x17 collectible item, and the opportunity to receive an autographed framed photo makes this a must-have collectible!