It depends on what you mean by "found"
If you mean graded more than 50% unfound on most cards. If you mean in known collections in hobby circles probably 50-65% are known. If you count collections and family heirlooms that people know they have but the general collecting world is unaware of the number is probably at 75-85%. If you just mean buried in Grandma-GrandPa's attic, barn, etc, I agree with Leon's 10-15% number obviously more on some issues and less on others. That doesn't mean there won't be another high grade find ever. there will be its just what set and how many.
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