Re: Slightly inflated cost estimate here?
You are clearly thinking as a right minded techie not a government contractor.
You would clearly need to procure new hardware and storage to perform your re-install on.
There are probably fees to retrieve the backups, especially if they are historic.
You need a few people to to the code review, but don't forget the account manager, project managers and "expenses".
Add a bit of a fudge factor for the internal costs associated with writing letters and administering evidence gathering for a prosecution it does not sound so hard to justify (regardless of any resemblance to reality)