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Posted By: Matt

Today in the mail, I received 3 different SGC slabbed cards, from 2 different sellers. I was looking at the slabs a little closer then I usually do and noticed that the 2 slabs from one seller have 1/2" marks at the top and bottom of their cases where it looks like something was wedged in between teh two layers of plastic. Then I checked the 3rd card and found it also has a similar mark on the bottom of the case. Which leads me to:
How would one know if their SGC case has been tampered with?
What are those marks all around the edge of the case?