First thing I would do is possibly get some new storage devices - one touch magnetic holders or toploaders, whatever you prefer, those old screw downs have a bad rep and history of damaging card edges and corners.
Also possibly check out the condition of the old penny sleeves, get some new ones of those so they aren't sticking to cards in the pages.
You also can check ebay or https://130point.com/ on the value of the cards.
Agree, yeah the Kobe Rookies and the AI Rookies into a magnetic holder to protect them.