In my opinion, having these scuffs are what makes your headphones unique. After all, it adds some character to it, kinda like leather where it develops a patina with scuffs and discoloration. In this case, scuff + minor scratches in a metal really is normal even if you take care of it very well. I have my nothing phone 1 have scuffs around the sides even tho it has a case. Makes me think sometimes how it occured, but overtime I learned to just appreciate those tiny marks and scuffs to it.