Unfortunately (not really) for Green I'd respectfully (not really) suggest the details surrounding the leak / initial search are probably irrelevant at this point.
They are saying it is a smear campaign by the police, notably, Bob Quick. Which is not impossible.
It could be, but it seem's very black and white, either they have evidence or they don't and their going to look very dumb if they don't, especially now they've double downed on it.
Davis threatening to walk if Green is 'unfairly sacked'.
In what walk of life is it where having a work machine full of cyber-filth is 'unfair dismissal'...
https://www.theguardian.com/politics/2017/dec/01/david-davis-threatens-to-quit-if-damian-green-sacked-unfairly?CMP=Share_AndroidApp_WhatsApp