The sensor and sensor cover are clean with no significant marks, see pictures. The only issue is the date and time don't track as they should. I have looked into this and it seems to be a known problem.
This has no bearing on the functionality of the back as it works perfectly. I can send you a Dropbox link of a few raw files to review that were taken on the day of this posting. For anyone that is not familiar with this back it uses a firewire connection.As far as I know there is no way of tethering to the computers without firewire or Thunderbolt 2 ports used with firewire to TB2 adapter. Or you an shoot to a CF card. I just noticed that the raw files can be edited in the latest Lightroom Classic.
Comes with two batteries and after market charger.