I think you misunderstood what I'm trying to say.
If I coded in a sound and for whatever reason delete the file, there is no immediate way to know if that sound was used or not, or to know how many times it was used or where it was used.
I know you can just go through each event sheet and look for where that sound was used, but for bigger projects this might be a pain. And since you can find all references for an object it seems like it would be a logical option to have something similar for audio files.