A checklist cannot exist without a card, so if you're still seeing the checklist somewhere, the card must still exist as well. Perhaps the card has been archived? If so, you can get at that card from the Board Menu > More > Archived Items: https://help.trello.com/article/795-archiving-and-deleting-cards
Hello Community! My name is Brittany Joiner and I am a Trello enthusiast and Atlassian Community Leader. I'll be sharing with you a series of videos with my top tips on how to best use Trello...
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