We're thinking the missing raft valve is at the Goodell Creek Campground (mi. 119) - had a blowout for my birthday a couple weekends ago.
If anyone from the Seattle area is driving by and finds this little critter, I'd be more than happy to meet you for a .
The signed campground and put in are on the south side of the road; there are group sites (unsigned) on the north side . We were at the 'Lower' site, meaning the west side of Goodell Creek (fairly obvious from the road). The site access is the first gravel road west of Goodell. There will be a chain gate; here you get to stretch your legs, take the dog for a walk, do some frisbee throwing (up at the site), etc. We were at the second (furthest) group site, and the valve should be within 20 feet of the northwest corner (back left) of the site (just a big gravel lot), and has a little hardware store biner on it.
BTW, this is one sweet campsite to know of if you're with a group. It only costs $25 a night and you can bring something like 30 cars and 60 people. Not exactly a climbing trip size, but a few people makes it pretty cheap.
Thanks for checking this post.