If you have the Adobe Presenter files you could re-associate the PPCX file with the presentation and that should put the audio back where it needs to be. Otherwise it will be a manual process.
If you are just dealing with the audio from the Presenter source files, then they are named/numbered in an archaic fashion that none has yet to figure out how to decode. However, if you have a published version of the presentation, then the audio files will be numbered according to the slide they are associated with. So that may be easier if you have access to a published version.