Obviously police have a lot of evidence, only some of which has been made public (thanks again to the KSL team for gathering, organizing, and sharing what they can--it's an amazing resource). Questions:

1) What evidence or information do you think is in the casefile that you would want to know, and

2) why do you think it would shed light on the case?

This could be something that the police know but haven't shared or evidence that you would want to dig into more, but this is something that would logically be in the casefile.

Wrong answer: Where is Susan's body? (not in casefile)

Obvious answer: What's on the encrypted drive? (yeah, yeah, we all want to know...but maybe you have an interesting reason why?)