Thunderbird Imap Mbox file crash

I need a senior system administrator with good knowledge about MBOX mail format, X-Statuses, Thunderbird specific particularities, large file editing techniques, linux sed, grep, etc. After I deleted a couple of mails, my Inbox got empty, I have no email on server (Imap). But the local Inbox mbox file still is 7Gb, so has all the content. I need to restore it exactly as it was before, including mail status (read, unread, replied, etc.) + mail connections, like Threads. I am a senior programmer so have a very good understanding of technology, so please don't bid if you're thinking about simple solutions like re-importing the mbox in a fresh folder or resetting all mail statuses to unread, or other far from perfect solutions. I want an urgent help, and will only consider a good rated professional, with good communication skills, that's available to work now, and voice-talk on Skype.