"all employees who were requested to do so voluntarily provided call and text detail records and billing statements for their personal devices for a defined period to the best of their abilities. The investigators reviewed the call and text logs retrieved but found nothing relevant in the limited logs."

All the other references that I can find look like they are limited to the Court's IT systems. That seems like it might yield evidence that someone contacted the press (if they were careless enough to use their personal device), but little else.