Hi
Strangely it was just on the news here..
There is supposedly a seattle/vancouver connection,the story named a guy and apparently he used to make regular trips to a bank in china town, and some of the money supposedly turned up in washington state.
He died in the late 2003 I think they said.

http://m.ctv.ca/topstories/20111124/sleuth-thinks-hijacker-db-cooper-stashed-cash-in-vancouver-bank-111124.html

cheers
Jerry