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davidScott, as I said before, the only way to test the theory is to physically examine a wide variety of graded cards.
While second opinions are always useuful and should be invited(whether they are from card graders or just a friend down the street), in the end it is the collector's responsibility to make the final judgements on the items they collect. Most to all restorations are not difficult to identify by the average collector, if he or she has a few tips and some 'hands on' experience. The collector who depends exclusevly on others' opinions (included professional card graders), only has to look into the mirror to see the problem.