Hi Carol,
Great question—there isn't an easy way to do that. Archived cards are included in the CSV export (https://help.trello.com/article/747-exporting-data-from-trello-1), but that's only available for Business Class subscribers.
You could get a listing of archived cards via Trello's API, though that would be a much more manual process, but that's the only way to surface that data right now, unfortunately.
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