Dont know if it has been seen (if it has I apologise) but if you go to the altruist camp on their highest water tower the all seeing eye looks towards Mt. Chilliad. If you view the mountain from the eye it is the best fit to overlay the mural I have found.
And in their camp is a load of crates with a lightning symbol on, which I had never seen. I then was just exploring and came across the Land Act Dam, this has a small balcony with doors and on this balcony is the same crates. May be just a general crate but I have never noticed them.