Might be able to recover the logs with testdisk. The email and other info might be enough. If you do get your logs back might impress the CS Prof. Shows willingness to figure shit out when things go wrong.

To me, what they did shows intent to commit a crime if not the crime itself. Possibly legal offences likely wont be taken lightly.

If your gonna hack shit it better be your own in a lab or have consent from the party involved

Bring your evidence to the CS Professor. See what they think.