Missing Session on PT 10

I've been working on a mix for few days. While working I'm used to save the session every few minutes, I did several changes being careful to save every time I did something major and after finished I bounce an MP3 version to listen outside and to my client. When I opened the session again to fix a couple things, the last version saved was from 3 weeks ago (I finished working on the 20th of November). I tried to go all around my computer without finding any file from that day, I even went on TimeMachine to that day and the same thing happened, as well, I went to my backup HD and nothing in there. This is very weird because it looks like if I'd have never worked on the project at all...

Anyone here with a similar issue? Or anybody who can help? I'm desperate with this because it was a pretty good mix... Any suggestions?

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Missing Session on PT 10