The Bus Depot - Highway Exit
Artifact #79: Family Photograph
At the start of the chapter, you'll pass an RV along the highway. Head inside to find this on a table.
Firefly Pendant #27
After descending the highway ramp, turn left and check behind the car for a pendant.
Artifact #64: Note to Wife
When you cut left into the bus depot proper, stick to the left to reach a pile of luggage. You'll find this artifact with it.
Comic #11: Precipitate
Once you descend the stairs after observing the giraffe heard, make a right to find a bathroom. This lies next to a stall inside.
Artifact #80: Salt Lake Q.Z. Map
When you arrive outside at the triage, head straight ahead to the farthest medical tent. Inside, you'll find this atop a table.
Firefly Pendant #28
In the same area, look to this set of lights near a green tent. A pendant dangles from them.
Artifact #81: Joel & Sarah Photo
Just before leaving the triage, Ellie will tell Joel she's "got something for him." Turn around and speak to her to receive the photo.
Firefly Pendant #29
On you way down into the tunnel, turn around past the bus and check behind it for another pendant.
Bus Depot - Underground Tunnel
Training Manual #12: Bomb Shrapnel
During the section of the tunnel with the two Bloaters, look for this truck in the middle of the area. Climb atop it to find another manual.
Comic #13: Catalysis
When you drop a ladder to Ellie, you'll be near a ventilation shaft. Run along it to find a comic book at the end.