It appears that a bag of trash was left in the shelter and other users came in and filled it up with more trash and other unwanted items. Some very kind climbers helped out the rangers by carrying down a large portion of the discarded rubbish. We really appreciate that kind of effort.
Please respect the public sheltler, Camp Muir, the National Park and wilderness in general and pack out all of your trash, extra food and fuel. This is a high use area and it does not take long to really 'trash' the place.