Good Day,
If you haven't tried this,
So if you're saying the wav files are all in the audio folder? Im no expert but know I have found wav files Id thought Id lost after a crash in Audio folder and imported them back into a track, if there are a lot of tracks and clips and
depending how you named them, it may take some sorting and aligning,
You could first try also,
Recompute Picture(s)
Click Recompute Picture(s) to redraw waveforms for individual clips that may have a corrupt waveform display.
(Select track, shift K, or right click mouse on track, associated audio files (at bottom)
Hope this helps
Cheers