Needless to say, Box Storage Area, part 1 is the first level of the Box Storage Area tunnel. It also serves as the first introduction to the special tile --- boxes to the players.
Boxes may seem to be strangers to the players who meet these special tiles the first time. They may seem to be strange, but they don't serve to have a special purpose in this level. They just serve as 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.