Coles was last seen on video surveillance, leaving his home near 81st and Vernon in Chatham.
Earlier, the police said they suspected they had lost the fake game in the collapse of Coles.
Joseph Coles said the police had no other traces of his daughter's search, but he refused.
"I believe my daughter is still alive," Joseph Cole said at Daley Plaza on Monday.
There is a $ 46,000 reward for information that leads to her whereabouts. Anyone who has information about Cowles was asked to call the South African Special Victims Unit at (31
"My world has just turned upside down," said LaSanne Walker. "Sometimes I feel like I'm alone."
Stacy Peterson's sister, Bollingbrook's mother, who disappeared almost 12 years ago, also spoke on Monday. She disappeared in 2007. Her husband, a former policeman of Bollingbrook, police. Drew Peterson is a suspect, but he is never accused.
Stacy Peterson's family still wants to find her remains.
Her sister-in-nurse still wants to find her remains. Norma Peterson has since become a defender of domestic violence. It helps to popularize what is known as proof of the misuse of evidence created as a result of Peterson's disappearance.
"What he does is allow the victims to document their abuses so they can tell people what it was like at the time," Norma Peterson said.
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