Saskatchewan girl Tamra Keepness.
In a statement Friday, police said they don't believe the hand-drawn map, posted to the website Reddit, is authentic.
"There is nothing to indicate that this information is authentic and a physical search of the area suggested in the sketch has not uncovered any evidence of Tamra Keepness or anything connected to her," the statement said.
"The Regina Police Service will continue to make efforts to contact the person who posted the sketch to Reddit in hopes of learning more about the sketch and the circumstances of its discovery," police said.
They also provided some details on the work officers did, following up on the tip which was posted to Reddit, a social media site, on Sunday.
They said investigators looked at a total of 21 wells using a special camera during a day-long visit to the Muscowpetung First Nation, northeast of Regina, Thursday.
Police have posted a $50,000 reward for information that could solve the case.
Keepness, who was five years old at the time of her disappearance, was last seen the night of July 5th, 2004, in her home in the 1800 block of Ottawa Street. She was reported missing to police at about 12:15 p.m. the next day.