@CornerConcerned asks
my list includes cards I sold months ago. Do I need to redo the whole inventory?
Jeff answers
I'd work through it section by section and mark confirmed items as you go. Keep sale and trade records beside you to resolve missing entries. @AtticRattata's duplicate-buying problem came from the other side of the same issue. Make the correction manageable, then build updates into future transactions.
— Jeff, infinitepulls.com