I think the picture shows that the orange tape was added after they found it, to hold it together.
I can easily believe that someone left it there a long time ago for any of a hundred different reasons. Death included.
Too bad that the person who originally found it did not take a series of photographs of it as was found, because the manner it was set down would have helped in the explanation.
http://freerepublic.com/focus/f-chat/3246956/posts