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PCI'll echo the sentiment expressed above ... the hobby is a mine field.
Is the PSA 6 card a PSA gaff, or someone faking a PSA holder and flip? I hope it's the latter, but that only makes me feel slightly better.
And the PSA 7 Mastro card looks real, but the edges of the holder are really cloudy. Not sure that means the holder was tampered with, but it sure makes you think twice.