- Use your layer to file to see where it points and the name of the file it points to.
Right Click on the Red Exclamation point in the layer file > Properties > Then use this information to narrow down your searches.
- Check your working directory and see if it is in there.
- If is is a shapefile it could (well should) not be in a .gdb, open the gdb folder in windows explorer then see if it has a .shp in it.
- Search your computer for .shp, .gdb, and .csv and check everyone with arccatalog. Be sure to turn on hidden files or folders.
- Do not run it again but set it all up and see where the default output points.
- Buy a beer and think about the importance of backups, restart the process, we have all been there.