Unfortunately no Easter eggs for you this year. If all the auto save files were overwritten too as you said, and you don't have another backup from your original project, you're screwed.
For the future, use a Save for the normal work, but also add a Save As with a different name to protect yourself from these mishaps.
My condolences. Also, increase the number of auto-save backups in preferences, it hardly takes any space and may prevent these situations. I set the number in my work place's autosave prefs to 240.
There is an option called Save a Copy
I use that everytime I have an important project.
This copy is saved to a different drive and does not get overwritten.
Without a backup, or useful AutoSaves, all is lost.
As has been stated, there are types of "Saves," and each has its use. This ARTICLE goes into more detail, and might be useful in the future. Unfortunately, that will only be helpful "next time."
I think many of os can learn from this, although it is such a shame for you guys :(
Thanks for the info on 'save a copy' Ann, I'm syrely going to try that out.
At the end of every day's work I always save incrementally dated duplicates
of my Premiere, After Effects and Encore projects to a separate internal drive.
This habit was born years ago from losing a project file to a RAID0 failure,
but I continue to save and archive to DVD all of these backup project files
just in case I get a read failure from a particular project's archive disk.
It usually only takes losing one project to work out your own 'fail-safe' method,
but I have not lost a project or element since I started this practice.
This is a proces that we nearly all learned the hard way.
Have you tried the document versions? http://windows.microsoft.com/en-US/windows7/Previous-versions-of-files-frequently-asked-qu estions
If you go back to the date before the saving error, you may be lucky. I have used this feature before. My recollection is vague but the process when something like: right click on the file and the versions info comes up under properties, I think. The last time I used this was in my former workplace under Vista. I hope this helps.
I will temper this with the fact that I am predoimnantly a Mac User so my recent knowledge of Windows is not superb.
This is a long shot, but have you tried a data recovery utility? Just because you overwrote a certain file, that doesn't necessarily mean it was deleted from your disk. When you "trash" or overwrite a file on a disk, really what's happening is that you're telling your file management system (OS) is that the physical location on your drive is available for re-use. The new file may be written into an entirely different location, expecially if it's larger, b/c the OS prefers a contiguous stripe, if one's available.
The sooner you run a data recovery utility after you've noticed your mistake, the better chance you have of recovring the "lost" data.