Trello recently added new functionality for marking a card as "Done" (
http://blog.trello.com/mark-a-trello-card-as-done). Your Trello connection in Easy Insight should now have two new fields. The first, Card Due Complete, is a true/false field showing whether or not the card has been marked as Done. The second, Card Due Complete At, is a date field showing when the card was marked as Done. Both fields can be found in the Cards folder. Enjoy!