If you're talking pre-1930s baseball only, I would say 10% or less.
Once you add in the 30s, 40s, and 50s, it would drop even further (since your title referred to "vintage").
I'd say 10-20% still not discovered or buried in cellars and attics, awaiting their day in the sun.
Plus the vast majority of pre-1930 cards are in such bad shape (torn/cut/creased) that it's not worth grading them.
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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