As of now it seems that this is just scam in the case of bitcoin.de. This is not the first attempt of this kind. The person trying to make money out of this wasn't able to provide any proof that this data is indeed what he claims it is.
Best regards
Oliver
This is good to know, it would be good to hear from the other sites, though I suspect this is a hoax/scam. As others have noted freebitco.in has a lot of users, but I'm not sure what the value of the passwords would be since they are tied to btc addresses not anything useful.