The computers have not been looked at they are trying to search warrants to look at them. The Atty's say that police pretty well know what is on the computers (I am taking it that Shelley told them what was on them)
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Yes, IIRC Shelley had her password. The police need a warrant in order to examine the computer "officially" and perhaps access information for which Shelley does not have a password.
What the police may be more interested in is accessing the things that were deleted on the computers. Deleted things don't go away. They just are relocated to a space on the computer to await being overwritten. There are forensic techs that can access the deleted items which may be far more revealing than anything else on the computers.