Upon closer inspection, I am 99.9% certain that they are not only completely refurbished (not just polished), but several sections have been laser welded. Look closely at one of the lugs. You can see where the two metals have been melded together.. Not very well in fact:
When done right, and only using the same quality steel (e.g. 316), a good polisher will be able to restore so that the damage was imperceptbile.
Here's an example of a good before, during and after of a lazer weld: