Sounds very plausible. BOXY certainly started out as catering to a younger audience. How long did BOXY last? Seems like quite a long time, given how much ephemera you’ve accumulated, Kelvin! I have to wonder if some designs were made as an attempt to reach the early audience that aged. Like taking the standard M5-1100 model and simply affixing an embossed “BOXY” badge on the clip. The catalog snapshot below shows the BOXY badge applied to a standard model, like the M5-1100. And it was done in a variety of colors.
EDIT: Here’s a colorways image I finally found:
But you have much better photos HERE, Kelvin:
The International and Nero models also look far more conservative and targeting young adults versus teens.