Yes its contents was stated in the article linked below.
The Idaho ID was in the box.
"Inside a bedroom closet, in a strongbox Blake had always been forbidden to touch by his wife, they uncovered her long-kept secrets.
Out poured her Idaho ID reading Becky Sue Turner, along with a copy of the deceased child's birth certificate and scraps of paper, one containing the name of an attorney and the words "402 months."
It still clearly didn't add up to anyone.
With the help of a private investigator, the family uncovered newspaper headlines from 1971 reporting the 2-year-old girl's death in Washington state."
http://www.nydailynews.com/news/nat...man-article-1.1383957?localLinksEnabled=false