Front grill 2003 Infiniti M45?

I just had some minor body work (mostly just paint on the fenders and one front quarter panel) done on my 2003 M45 (23k miles). When I went to pick up the car, I noticed the front grill appeared speckled. I asked if the car's panels had been sandblasted or if something had been sprayed that would have pitted the grill and the body shop manager said that was just pitting from road dust that must have aculated over time and I never noticed before. There are a few small chips in the actual chrome but this grill is a composite material painted over, and that part looks about 20 years old now, completely speckled and chipped wildly (and completely uniformly, not more on the bottom and less as you go higher). Is this normal for a car with so few miles? Did I just never notice it before? I'm skeptical. The air bag has to be reset, too, I noticed, so I figured they disconnected the air bag (they denied doing it), but they're sending the car out to a Nissan place to reset the air bag)