In my days as a local authority teacher dealing with kids' records, when we had to move/vacate premises I was obsessive about checking filing cabinets. I checked they were empty after it was time to clear them. I checked them again after everything was meant to be clear, and third time before they were moved. And our stuff wasn't nearly as sensitive as this.
The thing is, if they aren't bothered about the kids' sensitive information how bothered are they about the kids?