If you take your time and search around a bit before you charge into Destiny: Rise of Iron's new Wrath of the Machine Raid, you could put together some extra keys for opening those delectable SIVA Caches. Or you could just watch this video from YouTuber Arekkz, who lays out the location of a secret chest near the beginning of the raid.
Get to the chest and you should receive a handful of SIVA key fragments (among other goodies, potentially). Combine ten of those and you get a SIVA Cache Key, which you can use to open SIVA Caches later in the raid for more sweet, sweet loot.
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