I hunted WY Unit 5 for moose in 2004 and killed a nice representative Shiras bull... but, no monster.
Moose were hard to find, unlike several years earlier when they supposedly were all over the place. Many of the locals blamed the wolves migrating out of Yellowstone, saying the population had significantly declined over the previous few years.
We hunted some in the Wilderness area, but most of the moose we found were at lower elevations in the willow bogs. I can't find my topo map of the area, so can't give you a specific location, but I found my bull in one of the hillside bogs to the southeast of the point where the road up from Pinedale curves to the east into the Wilderness area.
One issue on my hunt is that there were elk hunters everywhere. This provided some benefit, as they were generally willing to share information on moose sightings, but it was more negative than positive, in that the increased human activity seemed to cause the moose to leave the bogs for the dark timber earlier than usual (this was according to my local hunting partner).
I enjoyed my moose hunt in Unit 5, but if I had it to do all over again, I would have waited until I could draw a unit that was further away from the wolves.
Good luck.