I used to think that it didn't exist but now I'm a believer! I saw it twice while playing gambit. I played multiple games in a row and saw it on my 7th one. I saw it again the day after maybe after 3 games or so. I highly suggest getting a team via lfg or clan. You want to be getting wins in a row, otherwise you risk not beating it when you do see it. We lost no more than once each time I played. Both times, we beat it (kinda felt sorry for the opposing team on the 2nd meatball encounter, but my team wanted a shot at the ship). Pick a time, play gambit for an hour straight with a PUG or clan. This week is your best shot at getting the meatball.