XLINKSTARTX1XHere is how to find 3/4 Insignia at this location. I forgot that I also searched for the last scrap (scrap) 9/10 for a long time. I forgot to take a screenshot. But...
This scrap is located in a closed container that needs to be opened. The action highlight works if you get close to the container.
When you enter through the main gate, you need to go left and walk to the end (to the container).
I stumbled upon this place by accident. But I see that people on Reddit are also looking for answers to this question. I took the screenshot from Reddit.
https://www.reddit.com/r/MadMax/comments/3jgmtg/need_help_on_the_the_pipes_camp/