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Tom Boblittto your point, I would somewhat agree. There are however, auction houses, who clearly use (and have admitted such even on this board) paper conservators on photos and advertising pieces. With that type of ongoing activity, it is not difficult to make the stretch that those same auctioneers might possibly be tempted to use those same conservators to polish up that 52 Mantle from a 6 to an 8 or other high profile marginally graded cards.
Just the mere association between the two on one type of transaction certainly would give one pause to consider everything else they handle. In addition, if that 'conservation' is not disclosed and it materially changes the face of the item, that certainly calls into question their ethics even further...