It's possible the hitmen could have cloned the drive, bought a replica, mirrored the contents and deleted any incriminating evidence, the parents are probably n

It's possible the hitmen could have cloned the drive, bought a replica, mirrored the contents and deleted any incriminating evidence, the parents are probably not advanced enough to know the difference between a file and a browser. I'd look for evidence that the hard drive shows evidence of usage by the victim here.