i've had this show up in my save too lol
instead of it happening out somewhere though, it happened while i was in my base
a light started shining in the sky outside the window and it started to get extremely bright, before it seemingly shot a white beam at me as it sent everything flying as the object showed up on the floor
i've gotten though all of the days in story mode plus 2 or so weeks more and nothing has ever happened to it, i think it's just a funny collectible item the game lets you keep