A couple of thoughts:
1. Five to ten cards out of 500 isnt a large percentage of "mistakes".
2. For the spot and off center it isnt hard to imagine they were graded with the "no qualifier" designation.
3. The guy who put the set together may have sought out cards that were low end for the grade for economic reasons.
4. The Wagner is a Wagner - dont think the numerical grade matters that much.
Of course, I could be blowing smoke................
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