Project File Replaced Clips with Wrong Media Files

Hello, hoping to find help.

I opened my project file and got the prompt "missing media files." The video files that the project file is trying to find are/were not even in my project - never have been, they are media files saved in another folder (on the same drive) . . . Looking closer at the sequence in the timeline, these missing (incorrect) video files have replaced (correct) clips/video files. I have worked really hard on this project, was almost finished, and wham-o, this unpleasant surprise. Thanks in advance.