You're right,but some of those crisp labels will nearly flake off in one piece,do to their age.You can then re-glue them onto the new case.Others shread off,so on those I've learned to spot them early,then I scan them over with my printer and make an identical copy & re-apply.
I only reprint em B&W & just do this for me and not trying to deceive anyone,plus an un-trained eye can spot it in seconds.
Also,some of the the colors of the plastic 8tk tape cases are really bold & flamboyant too,as opposed to the more common mundane black or white.Because of this,I collect as many interesting brilliant 8tk cartridge colors as I can,then re-label & re-tape.In some cases,it can really add to the sound.
Here's one of my examples of a Led Zeppelin tape,that found new life in a Barbara Streisand case.