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Josh K.Come on Leon, are you actually suggesting that there are trimmed cards that have been slabbed by grading companies? 
Seriously, it probably would only make a difference to me if I were bidding on high grade cards - which Im usually not doing. Low and mid grade cards, IMO, are less likely to have been altered and if they look untrimmed, I will accept the confirmation by the grading company even if the borders are a bit narrow.