I think those style 72 cello's were experimental. Not sure about pops vs. boxed but they don't show up all that much from what I've seen. When I wrote that piece in 2020 it was believed 5th series only carried the priced cello wrap. Has anyone found ones to the contrary since?
Linky-dink:
https://www.thetoppsarchives.com/search?q=cello