They have been disappearing for a number of years. Its a shame. I noticed they started going away around 2005....
I remember signing that Mt. Asa register....I was the first to sign it after 100 years of that register staying there....and then someone took it....same thing on Cloudy/North Star Mountain. After I signed it....then poof. Gone. Someone took it after I was there. Sucks! I have tried placing many registers. But I am not willing to carry the big brass dudes!