If Greenwald were trying to hide what he has, he could put the documents/information he has already leaked, plus a bunch of stuff he decided not to, plus some o

If Greenwald were trying to hide what he has, he could put the documents/information he has already leaked, plus a bunch of stuff he decided not to, plus some other documents that are undecided and innocuous in an unhidden (encrypted) partition- or have a second hidden partition- that he could give the Feds access to very reluctantly and such, and they would find all those documents and possibly think that was all he had. They still would not know what else he had, and really wouldn't know that he had anymore, even if they suspected it.