You are of course correct. I'm sure the disk will have been wiped according to government standards (DoD 5220.22-M). Just to be sure.
That would, of course, leave its own footprint.
And the excuse will be that the disk was to be discarded and therefore required wiping.
But, there’s the little problem of THE LAW stating that data must be retained, emails archived and indexed, etc, according to SOX.