Reason I rotate multiple knives and typically carry multiples as well, is to have the knife I need to cut whatever it is I need to cut, when it's time to cut it
(I also have knives I rarely or don't carry at all, the "collectors".)
I have certain knives I prefer working with outdoors,
I have certain knives I prefer with certain pants
I have certain knives I prefer for casual carry
I have certain knives I carry to work...
I work in manufacturing too, (before manufacturing I was doing commercial roofing), and it's filthy where I work, very abrasive conditions; sands, waxes, glues, (the roof was just as bad), none of which are necessarily "knife friendly", and not just to edges, but to finishes, moving parts, etc. Because of that, I won't bring a "nice knife" to work. instead I opt to bring knives I don't mind abusing a bit, and won't feel salty about if they would so happen to get ruined. (I once dropped a knife into a hot glue pan, completely coated it, and thankfully it was an all aluminum handled schrade, so I just left it sit on a separate inverted hot plate over night, melted 99.9% of the glue off, finished with an acetone wipe, and was good to go).
That said, I bring knives I find suitable to my liking for use in my given conditions whatever that may be... And I use 'em... I don't need my bosses and coworkers to see me with a $100 or more knife at work, I'm perfectly happy with my assortment of sub $50 knives I can happily use, abuse, and not care so much if they get broke, ruined, lost, or even grow a pair of legs and walk away (and they're still nicer and sharper then most anyone else's there). I have a dedicated strop just for keeping my working edges on my work knives and with any knife, i'm usually excited to get to use a fresh edge to cut something up. I might even go looking for stuff if nothing presents itself in a day or two, but I admit there have been times I just finished sharpening a knife, brand new fresh edge, and something "hard use" presents itself within the hour, and I'm like "got dangit, really!? I just got this edge where I wanted it"... But then, I get to cutting, and stopping...
Fwiw though, I ain't mad at you, utility knives are knives too. They serve their purpose... I personally try not to baton with my knives unless necessary, I prefer an axe/hatchet/saw to process wood. Like someone else said, they're your knives, use them as YOU see fit, be it opening letters, gutting game, a paper weight. or sitting on a shelf, but I do ask in regards to the cardboard box, what is the point of the nice edge you were worried about, if not for cutting? Personally, I would've cut that box like nobody's business, and then strppped the edge when I got home.