I'll jump in and share what I know.
Tosaw's finds are recorded in three places - his book, the YouTube clips about his work, and reports from those who worked with him, like Galen Cook.
As I recall the narratives, Tosaw never found anything connected to NORJAK. However, he did find a pilot chute on a wingdam a half-mile upstream from T-Bar, with Galen.
From the videos, I recall that he and his crew found nautical rubbish, such as a part of a motor boat, cables, and some household gear.
For me, the greatest part of Tosaw's legacy was his comprehensive involvement with NORJAK. First, he helped the Ingram family get their share of the ransom bills. Then he wrote the first authoritative book on DB Cooper, plus he is the only one to interview Tina in the convent. Later, he camped out at the Fazios for years to drag the river, and cultivated a search community, investing his own money to find evidence. He's even the source of the "fiery object" report and "Janet's" claims of a low-flying plane with something burning on the ventral side of the aircraft above the I-5 bridge over the Columbia, then it dropped away and arched towards T-Bar.
Not too shabby for a retired G-man.
I spoke with Richard a few months before his death in 2009. He was a nice guy. I'm sorry I never got to meet him in person.