After reviewing people's submissions online it seems that the DC shell, sparrow, and ship drop from specific activities. My conclusions came from youtube submissions which confirmed these sources.
STARLIGHT SHELL - only drops from ascendant challenges
SILVER TARCEL - only drops from the weekly mission (Broken Courier, Oracle Engine, Dark Monastery)
PALLAS GALLIOT - only drops from the Shattered Throne (Ogre or Dul Incaru)
If anyone has proof that does not support the above, please reply. I know many of you are looking for these items and could use the evidence. I have earned the Silver Tarcel but I do not remember where it dropped. I will reply if I earn the shell or ship from those activities (or others).
Thanks!
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8 RepliesFollow up: after running a few of the dreaming city activities this week I can confirm the original post. the Starlight Shell and Pallas Galliot dropped from the sources indicated (ascendant challenge & shattered throne). Note that the Pallas Galliot only being available every 3 weeks does have 3x the chance in Shattered Throne because the first icon encounter, ogre, and dul incaru all count as sources. Looks like these are locked behind weekly timegates and RNG also.