Plus they are high brass and the "worst one" was only corroded on one side, which is a classic pattern you see when stored in a cardboard box that got wet. If there is an issue, the action won't lock up. These are not that bad and a couple seconds with steel wool would knock that stuff right off.Use them, they are fine, i have shot some more damaged and they just puff.
Shot shells are more tolerant than metalic and u will be fine.
Shotguns are not precision machines.