Misinformation from deputy

The Woodstock (Ill.) Dairy Queen had posted a notice about missing person Beth Bentley where customers could see it.

One evening a deputy of the McHenry County Sheriff's Department (MCSD) was a customer at DQ and saw the poster about Beth. He told a DQ employee to take the notice down because Beth had been found. However, when the employee checked with a friend of the family, the employee learned that Beth was still missing.

The deputy, who has not yet been identified, must have believed that Beth had been found.
Where did he get his information? Were there others at MCSD who believed she had been found?