two bison: We have replaced the missing cache four times since we placed it. The location is such that the only way it can go missing is if someone takes it. When it is in place, it is not visible and you have to access it by either blindly reaching in (I don't recommend that at any time at any cache) or using a mirror. The cache had a very rusty (thus hard to see) wire that one might've been able to spot. My guess it that maintenance folks know of the cache and, when they think to look , they remove it. Whatever the case may be, we're opening this area up for someone else to try. Thanks to all who found/signed/replaced/logged.