Tina's supposed discussions with Cooper are in Tosaw's book (printed about 1985). They included remarks about the D-rings, the point that Cooper knew the airliner could take off with the rear stairs unlocked and partially down, the fact that Cooper had problems operating the stairs even after Tina told him how to do it, etc..
What Richard Tosaw wrote in his book is now questioned. Specifically, what he attributes to Tina is probably not true - or at least it is almost certainly not verbatim, nor a direct quote.
I think Tosaw used a "poetic license" and utilized "Tina" as the voice to replay information that he got from other sources. Bottom line, I think what Tosaw wrote he felt to be true and accurate.
However, it probably was
not Tina's actual words. Rataczak told me that he worked with Tosaw on his book, and he said that Tosaw described Tina as being impaired mentally - certainly her memory. Rataczak characterized it as "wiped clean like a white board" or words to that effect when we spoke in 2009.
Galen worked with Tosaw quite a bit, even camping out with him on the Columbia and diving in the river. Galen says the same thing about Tosaw and Tina - that her memory was shot.
Calame writes similarly, and says that her memory of November 24, 1971 is so poor that she would never be called to testify as a witness if DB Cooper was ever apprehended and brought to trial. A sad state of affairs for the primary witness to Norjak, particularly since she spent five hours in the skyjacker's company - and 45 minutes (estimated) of that alone with him.
I suspect that Tosaw got most of the information that he put in Tina's mouth from his brother Mike at the Seattle FO. At least that is what Galen suspects, and I think it is a plausible scenario. Mike Tosaw was an special agent in Seattle at that time, not assigned to Norjak, apparently, and also not well-loved by his brethren, according to Richard and Galen. I suspect that Mike Tosaw snooped in the office, fed it to Richard, who needed to cover for his brother and so told the world that he got the info from Tina.
I would have gotten the story directly from Richard if I was able, but we were just beginning to develop our relationship when he died of cancer in 2009. I spoke with Richard a time or two on the phone, and although he was a kindly gent and clearly somebody that I would have loved talking with, he only had limited energies and so I didn't push it. Alas.