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Joe D.100% agree with Chet.
If its in a slab... that is the third party opinion that the sale is based on. Will the graders get it wrong from time to time? yes they will.... and in doing so you should steer clear of that grader / not the seller.
I personally look to get all of my stuff graded because I don't want to hear from a buyer that something in the card is altered. If the recognized expert puts an opinion on it -- I think the seller is cleared from any disagreement with that experts opinion. Otherwise why even get these pieces of cardboard graded?