I’ve had my 3D for over three years, so I don’t remember if there were spots like that. I don’t believe there were. Perhaps there may have been a scratch here and there, I know there are now, just seems to happen.
As for the rust, I didn’t see that, but for the welds, I wouldn’t have known a difference as I’m not familiar with welding and such. I could spot out a bad weld, but that’s about it.
With that said, I haven’t had issues (knock on wood) and have really enjoyed using it. If you feel any of these will impact the performance, contact Steve. The number on the main site, call and he will probably pick the phone up. One of the great things for these cookers, access to speak with the owner to trouble shoot when needed.
Hopefully all is ok and you get to use that smoker soon.