What do you think was in the box on the movie cast away that he didn't open? It never said so
The content of the box that he did not open in the movie Cast Away was satellite cell phone. It was also solar-powered and waterproof and he made a mistake not to open it. You can check out http://homevideo.about.com/library/bldykcast.htm for more.
According to the screenplay, two cans of salsa. lady was sending to her estranged husband with a note, something about" getting the spice back " in their lives,