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davidcyclebackCorey's point is good. For those concerned about recent alterations, Nagy died a good number of years ago and the 'Nagy' labeled cards were consigned directly from his estate. So the cards would be less likely to have made the recent rounds of paper cutters, sandblasters, elecrolisis, etc.
One reason to by a Barry Halper card is you can refer to the 1999 catalog as see it's in the same state as 8 years ago. And Halper wasn't a condition freak, so you know he wasn't the type trying to get a PSA Mint 10. In fact, I believe Halper never had any of his cards graded and the catalog pictures them raw. So any nipping and tucking for professional grading's sake would have happened after those pictures were taken.