Any way to search for flashcards from a downloaded flashcard set that went missing?

I've been fiddling with an HSK 3.0 flashcard set and already find I've misplaced some. The set comes with a sub-category for Level 1 that had 497 cards at the beginning of the day. I spent some of the day sorting out the ones I knew by heart into Uncategorized, which has 202 cards, and Level 1 now has 282 cards, meaning 15 are missing. I re-downloaded the flash card set, intending to copy these 484 into a combined category and do a comparison between the two, but there doesn't seem to be a way to do this with Search. I might be out of luck, but is there any solution?
 
Not sure how, but all my uncategorized flash cards seem to have gone missing, so I could really also use this to recover the 202 cards by identifying what's in the original set but not in Level 1.
 
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