There’s an old thread about cards in archived lists not marked closed, but this is specifically cards themselves that have been archived. Cards I can clearly see in the archive on a board are returned with
closed: false when using either the
https://api.trello.com/1/boards/<board-id>/cards endpoint to list all cards or the individual
https://api.trello.com/1/boards/<board-id>/cards/<card-id> endpoint to get the same individual card.
As far as I can tell there’s now no way to see if a card has been archived. Was archiving recently changed? Is this something that just needs to be added to the API response?