A useful first sort
Separate obvious groups without pricing every card.
A first pass should make the collection easier to understand, not destroy its order. Group by broad category—graded cards, raw singles, sets, binders, sealed product, and bulk boxes—then flag the most visible material items.
Do not assume every old card is valuable or every modern card is common. Age, condition, scarcity, player demand, set, variation, and authenticity work together.
Tape removal, surface cleaning, trimming, recoloring, pressing, and chemical treatments can permanently reduce value and may make a card appear altered.