Your message is a bit unclear, but you will get files in this folder as the systems send in inventory. If the file dates are not recent, I would restart the inventory service.
Sometimes the services states it is running, but is hung.
After doing this, sort the files by date with oldest at the top, you should see them processing.
I have removed the inventory service and install again , reboot the server . but the *.scan files didn't process by inventory services.
I only remain one new recent scan file and del other . but this file exist at all time.