Exact ! In 2011, we must go to the manufacturor (bakelite specialities) wich made the bodies of this mine for PRB in the years 50-60 !
They made earthworks and found just one body. Someone, an old keykeeper, remember that, long time ago, the manufacturor made those bodies, and.........thought that this body was full !
Badly (or fortunately !), it was completely full of mud, stones,.....
Yoda