Yes, of course Ruth Paine knew, weeks prior to the assassination, that Lee Oswald worked at the TSBD. She was made aware of that fact on the very same day he was hired there (October 15th):
ALBERT JENNER -- "Did you hear from him [Lee Oswald] then either on the 14th or 15th [of October] in respect to his effort to obtaining employment at the Texas School Depository?"
RUTH PAINE -- "He called immediately on Tuesday, the 15th, after he had been accepted and said he would start work the next day."
But until Nov. 22, Ruth was not fully aware that there were two different TSBD buildings in downtown Dallas. And the explanation she gave to the Warren Commission concerning this matter (seen below) is a perfectly logical and reasonable and (IMO) believable explanation. But many conspiracy theorists who have a burning desire to drag Mrs. Paine through the mud and into an assassination plot of some kind obviously don't think this testimony given by Ruth is the slightest bit believable or credible at all:
ALBERT JENNER -- "I heard you mention the Texas School Depository warehouse. Did you think the warehouse was at 411 Elm?"
RUTH PAINE -- "No. I had seen a sign on a building as I went along one of the limited access highways that leads into Dallas, saying "Texas School Book Depository Warehouse" and there was the only building that had registered on my consciousness as being Texas School Book Depository. I was not aware, hadn't taken in the idea of there being two buildings and that there was one on Elm, though, I copied the address from the telephone book, and could well have made that notation in my mind but I didn't. The first I realized that there was a building on Elm was when I heard on the television on the morning of the 22nd of November that a shot had been fired from such a building."
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Repeating something I wrote on July 25, 2022:
I think it's important to keep in mind that the Depository warehouse building on Houston Street that Ruth saw while driving on Stemmons was located very near Elm Street. It was only---what?---two blocks north on Houston. So the two TSBD buildings were, indeed, very close to one another.
Given that fact, I don't see why it wouldn't be possible for someone casually driving on Stemmons to think that the "warehouse" building on Houston was located on Elm (or vice versa). Was Ruth supposed to keep track of all Dallas streets at all times and where things were located on those streets? Why would she have cared what street that warehouse she saw was on? And why would she have needed to commit such knowledge to memory? It didn't make any difference to her what street that TSBD warehouse was located on.
The conspiracy theorists who think that Ruth Paine was involved in a scheme to plant Lee Oswald in the TSBD on Elm Street must think otherwise, of course. But I'm not wired with "Conspiracy" circuitry. So it's my view that the "Elm Street" address that Ruth did, indeed, write down in her address book (and see in the phone book) meant very little to her at all. And therefore there was no reason for her to concentrate on that address at all after jotting it down in her address book or seeing it in print in the telephone book. And, in fact, she pretty much told us that very thing in the above testimony.
Lots More: