But yes, someone made a disk image before it got turned over the FBI.
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A disc image only tells you the state of data storage as it existed at the time of the image. You cannot do a forensic scan of every gate to see how the previously existed and find previously deleted files if they have been overwritten.
However, if Hunter had only been using a small fraction of his HD (well less than half) then there is a good chance that a lot of ‘deleted’ file data was never overwritten.
But having the original physical hard disk itself (not an image, mirror, or even part of array) allows you to recover more.
In this post it is claimed Maxy is continually working to recover files while presumably he does not have the lap top.
I assume he is working from a disk image.