The graders know about all issues no matter how rare they are. They take lots of notes when they are reviewing a card and have to type up their notes in the system before they can leave for the day. They don't sign non-disclosure agreements but they do love the company so much that they never tell the secrets of the grader after they leave. And everything I've typed in this post is a big pile of horse neers.
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I'm always looking for t206's with purple numbers stamped on the back like the one in my avatar.
The Great T206 Back Stamp Project:
Click Here
My Online Trading Site:
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Member of OBC (Old Baseball Cards), the longest running on-line collecting club
www.oldbaseball.com
My Humble Blog:
Click Here