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cmokingMatt, those may have been crossovers. M/G could be a minimum grade not met on a crossover from another company, and the others PSA may have rejected while in another company's holder for evidence of trimming. I don't know if that's damning to PSA or another company...or both. Not enough information.
Mike - cardtarget - great tool! Thanks for setting it up.
While I think its really interesting, I'm still not sure how to make any useful conclusions from this information. Let's say I hit up a cert of a 1933 Goudey PSA 7 card, and all 21 cards that show up are 1933 Goudeys. 17 of them are graded PSA 6 or 7, and the other 4 are rejected for Evidence of Trimming. What does that tell me about the 17 that were graded? It could very well be that PSA rejected the correct four and slabbed the correct 17. Even if the numbers were changed, say 11 graded and 10 rejected - why are people assuming that the 11 graded are not suspicious? If the grader rejected the other 10, maybe he was being too careful and rejected too many cards, so that may mean the 11 that were slabbed are definitely clean.
On the other hand, let's say someone submitted 21 T206s and all of them got PSA 7s. Does that mean all of them are definitly clean? Maybe the grader let some slide, maybe there was collusion going on (for the conspiracy theorists). Why are those 21 clean but the 15 not as clean if 6 were rejected?
I don't know the answer. I've yet to hear a good answer for that question. All I here is suspicions. Yes, I have suspicions too...but on the cert numbers and Grades alone from the database, I don't know what conclusions to draw.
I'm looking for ideas on how to make this information useful, other then just being suspcious. I know the cert information is useful in conjunction with knowing the submitter. But without knowing the submitter, I'm not as confident about the info.