I talked to a WDFW about the Mid Hood Canal strays at the Mill Creek meeting last month.
I was a bit surprised when I read the material they distributed and presented that those fish were present in MA 11.
I always figured they'd head north out into the straits or ocean if they strayed out of the canal.
My memory isn't quite what it used to be, but If I recall correctly, he said some mid canal chinook are caught as far south as the Oregon / California border.

He also mention something like 21 of 250 PIT tags from MA 11 being mid hood canal fish.

I have his business card if anyone would like to pick his brain a bit more on this and verify if I recall things correctly.
Drop me a PM and I'll get you his contact info.
SF