Here's the on how to find 3/4 Insignia at this location. Forgot that I also searched for the last scrap (scrap) 9/10 for a long time. I forgot to take the screenshot. But...
This scrap is in a closed container that must be opened. Action lighting works if you approach the container.
When entering through the main gate, you have to go to the left and go to the end (to the container).
I somehow accidentally came here. But I see that people are also looking for an answer to this question on reddit. Screen took from the reddit.
https://www.reddit.com/r/MadMax/comments/3jgmtg/need_help_on_the_the_pipes_camp/