"a big rocl with some concrete and chips sticking out of it"

There should be a number of concrete chunks out there with Stardust chips imbedded in them. The guy that jackhammered the chunks out, worked at the FQ's in later years. He told the story about dumping them. He also had some very nice chips that he had rescued from the ruble. If I remember right he sold some to CT Rodgers during a chip show at the FQ's. Stardust $100's.