We did compare the old rotors to the new rotors and the old rotors measured 3/8" thickness and the new rotors measured 1/2". Even with the severe scoring on them from the test drive, Napa cheerfully did take back the new rotors. They maintain that either the new rotors were defective or that we should have replaced the calipers as well. Long story short, we put new pads and the old rotors back on. For now, this will have to do but when I replace the rotors in a few months, I think I'll call FPC Groton.
Thanks everyone for your help!
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