Good question, Rich.
I caught one this year in July in the Quilleute. Definitely a rainbow, as opposed to steelhead, native, and about 14" - 15" long. Deep bodied, and strong. Since I was after steelhead, I took a look, re-launched him, and then wondered why did I do that?? It was definitely a legal keeper, and a nice one at that.
A few days later I saw a post, perhaps yours, about some dead trout in the lower Bogachiel, probably from a pond or some other source. So I figured there was a connection and gave it no further thought.
I'd be interested in the photo, too. My thought is that it was just a darned nice trout, and be happy with it.