If you use /explore shuffle_back_into_deck explore_card_id: crf6, it will put a "crf6" into the deck, even if you do not own 'crf6'. This can lead to duplicate fragments.
It'd be nice to have: /explore discard_fragment type:cultural (similar to how purge works, but places it in the discard pile). Useful for homebrew, or NRA grabbing the wrong thing.