Box Storage Area, part 1 is the first level of the Box Storage Area tunnel. It also serves as the introduction to the special tile - boxes.
Boxes may seem to be strange to the players who meet these special tiles the first time. If you played Run 2 you may know something abut boxes. They may seem to be strange, but they don't serve to have a special purpose in this level. They just serve as a substitute to normal tiles, so you don't have to land on a special face of a box or something similar.
This level only serves as an introduction to the boxes for new players, so they won't freak out when they meet these things in later levels.
This tunnel plays a major role in the Bridge Building quest, since most of the boxes are located in this Box Storage Area tunnel.