The appearance scores can only be changed on the instruction from the KCBS rep (at a KCBS sanctioned event). That would normally happen if after removing the pieces of meat it was discovered that there was a foreign object in the box, like a lettuce core or something they couldn't see when everything was in the box.
Another way to judge appearance would be to judge it after the meat has been put on the judging plate. Then you can be assured that the judges are judging the appearence of the meat and not the garnish.
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