So, about a week ago, I was sitting at 389 light. Most all my gear was above 390 (with the exception of a helmet which was 389) but my Ghost was 385. I grinded for faction packages through my faction, Crucible, and Vanguard. 8 packages, no ghost shell. Finally, a FWC dropped one at 390 for me. Since then, 11 package openings. 8 ghost shells.