Shipping number

One afternoon in the Fall of 1987, I sat squirrelly in a plastic chair on the end of the second row in music class. Being disengaged in the song selection from the hymnal, I instead focused my attention on a tracking number that had been stamped on a cardboard shipping box across the room. I still remember that number. NWXCWH1T221606314384NB. No, I don't think that's normal. But I do wonder to this day what was actually shipped in that box. I mean, what if there was something scandalous shipped inside that box; just maybe that box has an interesting story behind it. You never know.