Or: Why I'll Never Wear Trainers On This Planet Again.
"The small silvery object was one of many that turned up during the dig. Doleman presented slides of what looked like a piece of PVC pipe and fragments of plastic, as well as what seemed to be leather and rubber from a shoe. Doleman said that they had not been analyzed, and he would like to confirm that they are what they seem to be."
http://www.roswell-record.com/main.asp?FromHome=1&TypeID=1&ArticleID=42044&SectionID=49&SubSectionID=112