Nancy Drew Guides:
If you do not know what to do! We will help you ;)
Investigating the Break in
You have to take the evidence sheet and when you open up a drawer and find it empty, use the evidence sheet on the empty spot.
There are 6 drawers total; Nancy says no to three and "Interesting" to three. Once she does those three a dialogue triggers and she says you can go over to the judge to ask for the CCTV footage. He'll tell you to come back in the morning.