Jaycee Dugard Abductors' Chilling Homemade Videos Released
07/14/2011 AT 11:15 AM EDT
Two clips feature young children playing in public in the late '80s or early '90s, California's Mountain Democrat reports.
One shows Phillip Garrido playing a guitar and singing in park, although the camera is focused on the kids playing in the background.
Other documents released this week include a 1972 booking photo of Phillip Garrido and a note signed by Dugard herself.
The Garridos pleaded guilty in April of abducting Dugard in 1991, when she was 11, and holding her for 18 years. She was used as a sex slave and bore Garrido two daughters.
The release of the documents is intended to show how much information the state had on the Garridos – and to try to see how they evaded suspicion and capture for so long.
Last week's PEOPLE had eight pages of exclusive excerpts from Jaycee Dugard's memoir and never-before-seen photos