The Wall panel note is an optional artifact taped beside an electrical panel in the university library area. After you pass the first metal gate and hear runners nearby, head to the next gate on the right and look at the wall to its left.
A brief warning that someone wired the door to run off a generator upstairs and asks everyone to use it sparingly because fuel is running out.
It tells you the gate needs power from upstairs, which is how you get through this part of the campus.
Firefly's recorder
The Firefly's recorder is an automatic artifact in the university science building. Joel picks it up from a dead Firefly in a cutscene, so it cannot be missed, and you can play the whole message later from the Artifacts menu.
Free Radicals
Free Radicals, issue 7 of Savage Starlight, is on the rusty hood of a car up the hill behind you as The University begins.
Fungal X-rays
The Fungal X-rays are an optional artifact in the university science building. After you follow Ellie through the short tunnel, turn left and check the far table next to the window.
Griggs's Firefly Pendant
Griggs's Firefly pendant lies on a table in the last tent of a camp outside the science building, in the Go Big Horns section of The University. It belonged to Erik Griggs.