69 camaro - GM gas tank vs repo

[enio45]

here are some updated pics of the tank....they are similar to Tims pics






Like I thought earlier - this might be NOS tank over the counter as the guy I bought the load of parts from worked at
the GM dealer parts counter and he bought a bunch of parts for this Z28. I was considering using this as I already have it, but I do like the repo tanks finish - this would take me hrs to try to remove yrs of scratches that this has been subject to so for the money - it was/is a consideration. How do you all clean these nos tanks up? Use any metal polish on them?