How do you know? They did find one pack of the money decaying in a creek but i think that was it
If they compare the sketch to Boeing Employees and contractors at the time, they may find their man
I think Cooper probably died in the jump, but cannot pretend it's beyond reasonable doubt. What I would say is that if he died then he likely would have been reported missing if he were in regular employment at a place like Boeing. Though he could have been an ex employee.
This find is definitely of interest, but let's everyone not jump to conclusions about him working for Boeing. Im certain other places also used these rare earth elements.