Lost Audio Files with no back up folder

I was editing a podcast and noticed I didn't have the option to save. (but I believe after reading this software automatically saves your work) I turned my computer back on to find the skelton of the project there (all the edits/cuts) but no actual audio. I have not be able to link re link the files as they are nowhereto be found. It crossed my mind, I may have accidentally deleted them, so I installed recovery software but was not able to pull up anything! I have read online that this happens but the tips and file paths suggested have not led me to my missing files. I tested the file path by creating a new project, recording my voice and was able to find those files and re link them. Any idea on other ways to find missing audio files?