Lays Ruffle potato chip bags, all the same. It is most likely an area for the mechanics to get a free beverage and bag of chips while they work. When you couple in the pic came from BW only adds to the theory it is from his race car garage and not a retail store.
As German philosopher Arthur Schopenhauer once said, "truth is ridiculed, then denied, and then "accepted as having been obvious to everyone from the beginning."