Well, without having read the actual short story, it's hard to be precise. However, if we consider common themes in short stories, the oblong box could be a MacGuffin - something that drives the plot forward. It might be the center of a conflict, either between characters who want to possess it or those who want to keep its contents hidden. There could be a sense of mystery and suspense built around what's inside the box, and as the story progresses, the true nature of the box and its significance are gradually revealed to the reader.
I'm not sure specifically which 'the box short story' you are referring to. There could be many stories with that title. It might be about a mysterious box that holds secrets, or perhaps it's a box that has some sort of magical or life - changing properties.
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I'm not sure specifically as there could be many stories with that name. It might be about a man who has some sort of relationship with a box, like he could be living in a box, or the box could hold some mysterious items that are central to the story.