mtssler:
Most of us have the track number in the actual file name... do you?
Are your track numbers the first thing in the file name?
If yes, what separates the track number from the next item in the file name?
Depending on your answers for the two questions above, we could help you use the the 'fill properties from filename' tool to repopulate your track number fields.
If they all follow the same template, or at least, all start with the track number, you will be able to reliably fix them en-masse.