Agree with Greg Morris, as a great resource for selling some or all of the collection.
Also... I've had dozens of cards that resided in non-recessed screw-down holders for nearly 2 decades. They were removed with no issues whatsoever, and were submitted for grading. All received grades varying from 5 - 7, with none deemed simply Authentic.
If your cards were subject to moisture or humidity, it could be an issue, but I am betting you'll be fine otherwise.
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