This The Last of Us 2 Collectibles Guide for Chapter 5: The Park has all the locations for all 3 artifacts.
The Park Collectibles
- Tracking Lesson Collectibles: 3 Artifacts, 1 Coins
Artifact – Thank You Card from Mel and Artifact – Owen’s Drawing
You automatically already have 2 artifacts in your backpack: Thank You Card from Mel and Owen’s Drawing of Abby.
Artifact – Zoo Holiday Brochure
Move forward, crouching under branches as needed to continue on your path until you reach the building ahead. When you do, go to the gazebo and pick up the note on one of the benches.
Coin – Virginia
The gate/door nearby with the footprints is locked so you’ll need to find another way around. Head to the right and crouch through into the bathroom. Loot it for supplies. Pick up a throwable object and use it to break the window above the counter so you can climb up and out of there. Interact with the dumpster (furthest right) to pick up the coin resting on the rim.
Source: IGN.com The Last of Us 2 Collectibles Guide Chapter 5: The Park