I just got a Special Weapon Legendary Engram from a Silver Chest. Start farming boys, loot cave no more, time to hit up those chests! And so ya know, when you hit a chest there is instantly another one spawned in the zone. Just find the loot cave sequence, and happy farming!
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This has only happened to me a couple times. Kind of a waste of time. Efforts are better spent in the raid or the crucible.