As we know, Tosaw conducted searches upstream of Tina Bar and the Ingram find, on the hope more money and even Cooper artifacts might be hung up at some wing dam or cul de sac. Except for something judged to be a flare parachute, found near at a wingdam upstream from Tina Bar (and turned in to the FBI), nothing of consequence was found by Tosaw and his divers.
Curiously, Tosaw never searched 'downstream' of Tina Bar, even in areas directly connected to the Tina Bar money site by flow. Immediately down stream of the Tina Bar find would seem to be the obvious place to search? If the money survived to flow and wind up on Tina Bar, why not just a bit further down stream in an obvious catch basin?
[edit] My theory is if the money arrived via flow, then there is a positive probability that money settled out at more than one location, in-line with the same flow (event). If the money arrived by mechanical means and got buried, then it should be in one primary location only. Since we don't have data from searches downstream of the Ingram find, we really don't know - can't decide. Maybe the area downstream of Tina Bar could still be searched? It should have been looked at in 1980 or by Tosaw later?
See attached photos ...