Completely ignoring that there could have been something on the flight, or series of flights, immediately before yours. But, crack on...
Like what? They clearly made it to the stand in one piece.
As I said above "If you have had a reportable incident or accident, and have survived, then you would be required to preserve the data for the investigation"
If the previous crew had been in that position they would have taken steps to preserve the data by pulling the CB and making a tech log entry to that effect, the CVR will be either be downloaded or pulled and replaced before the aircraft is dispatched again.
GroundedSpanner sums it up perfectly.