I can tell you for a fact that one certain auction house used to get preferred treatment from PSA as I have experienced it first hand. I consigned a very large ungraded collection to Mastro back in 1999 and when discussing the collection and potential cards to grade, I was told by Brian Marren with Mastro to let them send the cards in to grade as any cards on the fence would get the bump to the higher grade.
Don't believe for a second that any auction house submissions aren't known by the graders.
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