re Cryptsy

They got sold.
Microguy picked up most of them, and returned .dat to each community.
If he had SMC then psionin woulda been contacted.

So I would say an educated guess is yes Cryptsy could be a large dormant LOST pile.
Yobit and Cryptopia wallets?
Cryptopia looks to never be claimable.
Yobit will likely resync in the year 2023 and actually have functional services should they last until then.