yes, this makes sense, I dont think I came across any cello 1975s.
If you did, then the retailer probably ripped off the lid to display them, so the box wouldn't be memorable now. I remember seeing cellos at Roses Department store in my area. I don't remember which year, but I do seem to remember the box being lidless. I actively collected from 73-77 and liked cellos and the rack packs better than the wax packs because you could see which cards you were getting. I dabbled with collecting during what's now referred to as the "junk wax" era and purchased a cheat list for the rack packs so I could load up on some highly rated rookies that are worth less now than I paid for them in the late '80s.
I've been collecting the older sets from 68-73 a little at the time over the past few years, so I'd be tickled to just find unopened wax packs from that era at a reasonable price these days.