User:SOTO/Forum Archive/The Panopticon/@comment-28874584-20160711192556/@comment-188432-20160720181708
Oh, cool. I've never taken a complete inventory of all the boards. If Sara's there, she's there.
But it doesn't mean that her existence on a Black Archives bulletin board is necessarily that big a plot hole, even using solely televised stories.
She does make it to Earth in the 20th century in "The Feast of Steven", and in Hollywood. It's easy to see how UNIT may have gotten a report on her showing up in the media capital of the world -- even if it was a few decades prior to the foundation of UNIT. And, of course, the whole crew has interaction with several British cops before they even get to Hollywood -- one of them could easily have filed a report that UNIT could later have discovered.
Of course, we don't know anything about the Black Archive report on Sara. It could be as simple as a one-line entry: "Sighted with the First Doctor in early 20th century Hollywood." It doesn't have to say, "Member of SSS from the 4000s."
And that's why Shambala is right to point out that it's speculation to wonder how her photo came to be in the Black Archives, or what the report said. We can only report that her picture was there.
I do know that for the Tegan and Nyssa pics, the proximate text is very skimpy indeed. Basically, it's just a name and the ordinal number of the Doctor they travelled with. (Though that's quite an amazing coup, and I think the first time we've actually seen Doctor numbering onscreen.)