I happened to take a few Fairphone 
shots the other day (actually just to upgrade our meetup announcement picture), but took the opportunity to lift the “forbidden” core module shield off the FP4. You can figure out a suspect easily, although I am not 100 % sure.
A second Fairphone 
suspect:
I guess the assumption is close by that this is where the FP4 might have got another LCI as well. However, I already checked and the FP4 does not have an LCI in the battery tray.