If you are still stuck, please scroll down to learn more about each hint.
Hint #1
Somewhere in your evidence is an item that will give you specific details of when Alex returned to the cafeteria. You'll need a precise time in order to accomplish objective 1.
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Hint #2
Find the document that states when Alex returned from the bathroom. Look for the time marked under the 'Return Time' section next to Alex's name. The document you'll need has lots of names, places, and times on it.
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Hint #3
Did you closely inspect Ethan's rocket launch photo? Try magnifying your gaze and taking another look at the school. Notice anything near the entrance? In the window?
Still Lost?
Here's a final hint to get you to the next objective...
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What time is visible on the front of the school in the photo of Ethan's rocket launch? What furry friend can be seen in the window of the school?