All of my color coded video tracks dissapeared

Awhile ago I worked for over a week on a project with hundreds of video files. As I was cutting each video file, I had an entire color coding system I used to label the shots as I edited them. I had gone into the keyboard shortcuts and made my own shortcuts to make labelling each video file with a color easy for me. Then I set this project down and worked on other stuff for many months. When I was ready to edit it again, I opened up the project, and all of the colors were gone. It was all just the default blue. How can I get those colors back? They were very important to the project obviously and I'd be lost without them. 

A few more details that might be important. When I opened it back up again, it was in a newer version of Premiere and it made me make a new project for it file for it. I figured this was the issue so I attempted to open it back up with the other Premiere versions I had on my computer (I havent gotten rid of any Premiere versions in awhile), but to no avail. In every version the colors were gone. I am very confused and would love some help if anyone has experience with this. Thank you for your time.