I have collected a few factory-images (+some manually created partition dumps) here: https://fp3.lrnz.org/stock/
With the approach mentioned by @adamzkover I found three images in the wallpaper picker for A.0134: https://fp3.lrnz.org/wallpaper/
Are these the ones you were looking for?
Edit: I really like the xray image from ifixit as wallpaper: https://www.ifixit.com/News/32964/fairphone-3-teardown-wallpapers