First pic-UFO- which show up when you collect all of its parts
Second pic- cracked egg (solving the mission/mystery)
Third and final picture--->flying man ?? ----> directly connected with ufo....which means:
mural is just a message. there is no jetpack ingame. collect all parts, the ufo will show up, and your last goal is to crack the egg (mystery) and obtain that ufo. how? don't know, but now i'm focusing on that ufo not, jetpack anymore.
also spend few days searching through game files...no sign of jetpack file