On June 30, 1999, the body of Ricky McCormick was found in a field in St. Charles County, Missouri.
McCormick had been missing only 72 hours, but his body was already badly dicomposed.
In 2011, FBI revealed they had found two notes in McCormick's pockets in a complex cypher. (copy of the cypher above)
McCormick was a highschool drop out who can't barely write his own name.
And to this day, no one knows what the cypher even means.
Source: www.cracked.com