I am sure any incriminating evidence has long since been destroyed
I wish I could remember the Supreme Court case from the 1920s involving a railway accident. A log that the railway was mandated to keep that registered the times that something (oil, brakes, hydraulics?) was supposed to be checked was subpoenaed. The railway said they couldn’t find it. The Court’s decision was that since the log was mandated to be kept, then whatever the plaintiff was alleging must be true. It was a gimme.