He probably has curb-rash the rim before and some shop try to polish it. And that's the problem with chrome lip, it gets scratches easily and almost impossible to remove....
Not very true..... 
Remember the first set of Vosseen I had on the Z?? I actually curb-rash it in the summer, a long one....
Brought it to the shop, a good one, once they saw it's chrome, they shake their head and nothing can be done to restore to original.
They explained to me because the chrome is a from a plating process, and there's no way they can chrome-plated the rim again because they are not the factory, and buffing and polish can only remove the scratch and smoothed the surface, but there will be scuff-marks on the area.
Eventually they did it in front of me, smoothed the area, polish the lip, but yes, there's scuff marks.
But the scuff marks is so mild that you can barely see it...
