Not surprising. I once had to have a 1/4" thick shoulder removed from the outboard side of new AC Delco brake drums.
I have a friend who owns a muffler/brake shop here in Atlanta. He turns drums and rotors straight from the box as a matter of course. They are all from China and they are all warped to some degree or another regardless of brand.
No, you can't do anything to them at home short of scuffing up the surface with sandpaper. Take them to a brake shop or NAPA. NAPA and O'Reilly's around here will turn brake rotors.
