From: GranzonEx | #409
You buy the ciphers at the Spectre terminal. I couldn't find out how to get the Benning evidence, maybe I could have bought it at the Spectre terminal too >_>
Nah, you can get the Ciphers from this one planet that Traynor gives you, I think. It was the very last sidequest I got, between Rannoch and Cerberus HQ, AFAIK.
I think the Spectre Terminal acts as a backup in case you miss something important on a planet, since you can't return there to pick it up. But I'm not 100% sure on that. I know right after Rannoch I went to the Terminal and it showed a Geth item of some sort, and if you read the description it says something like "Pretend you got this on Rannoch." and I got it so I could finish a sidequest.
As for the Benning Evidence, when you actually land on Benning for a sidequest, you can find a Dog Tag on the ground there somewhere and pick it up, and it's the quest item. I know I had to reload and retry the mission for that because I realized after the first time I cleared the mission, "...Wait a second, I was supposed to get something here, wasn't I?"
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