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randgreat question. i hardly ever crack the card. i am an avid SGC collector/submitter. i believe the graders at SGC are very honest and do not take it personally if a card is sent back for a review. they will send back the card in the original holder if it is not bumped and place a baggy over it and circle the problem area for me to look at.
once in a blue moon i will crack the card and send in raw, only twice in 5 years has it come back higher.