Did you drop it or allow it to be in contact with any edged/sharp objects?
I didn't. I was aware of "scuffgate" since before receiving mine on Friday and have handled it very gently (which sucks, to be honest, because after years of no case iPhone usage for my last two, to have to even worry about that sort of thing is... wrong? Feels wrong to me.). If I had to guess, I'd say it got scuffed from when it went on one car ride with me. In the past, my phone would go (securely) into my center console where it would function as both music player and map, and while I never had an issue with the previous iPhones, I think that's where it earned its gash.
I know some are going to say that because of that scenario (which was fine for the past four years!) I somehow can't take care of my stuff, but I personally think it's ridiculous how easily the edges get dinged up. The insides of the phone are clearly top-notch, but this is a massive oversight and the first time I've considered returning an iPhone.