Recovering Earlier Project Version

[Moderator moved from Adobe Creative Cloud to Premiere Pro CC.]

I've been working to complete the sound design for a short film of mine. I've worked with the audio tracks extensively. Recently I brought it to a friend who is a sound mixer to help me finish the project. He gave it an assessment, and determined that it would be best to start the mixing process with unaltered audio tracks, basically from square one. Rather than having to replace each audio track I've done work to, I know that there is a way to locate earlier versions of the project through project auto save. Basically, I would need to locate a version of the film from about three weeks ago.

     I believe that there is a way to do this through scratch disks via project settings, but when I browse project auto save, the auto saves from the past two months are not there, and I'm quite sure I did not change my settings to delete media after a certain period of time, so it should all still be there. Can someone explain to me the easiest way to locate an earlier version of my project?