Rumor is they are up around the Lake Wenatchee area. My buddies uncle who mines up around Chiwawa told us stories of seeing Moose, Wolves, and even Grizzlies. I've heard of Grizzlies in the Tumwater canyon before as well.
Regarding the Moose I know the ones they captured in Wenatchee were relocated up Derby Canyon. My buddy lives near the base of the canyon and followed the release rig up there. They periodically go up there with radio collar tracking devices and search to see where they are. It's pretty good habitat for them up there and around the upper Swakane with all the bogs and such. Wouldn't surprise me one bit to know they're up around Lake Wenatchee.