There is one way to find out, and thats go look. You will be hard pressed to find ONE soul, to give you solid information for the area. If you do get information, there is a 90% chance they are just blowhards and don't have a clue. It is the most guarded secret in Washington. 99% of anyone worth their salt that knows anything about it, isn't going to share. Essentially its the perfect tag if you know what you are doing. SECONDLY, you pretty much have to completely understnad the animals there or camp on them to know where they will be when. In other words, live there is your best option.
I know loggers that live there in Ione and bone is right. They tell me where to hunt and the nonlocals aren't even close to them.