For some reason, nobody paid attention to it - until now.
A talented gymnast, Berg was last seen at a friend's house and never heard from again.
Antigo Police Chief Eric Roller police says he is taking the video seriously. "She was wearing jeans, a similar top, had a similary look that she has," he said, remarking on the similarities between Berg and the teen in the video.
Cops are urgently trying to track down the guy seen in the video. "We're not sure if it's a hoax, or if it's true. If it's true, but not our case, it may help somebody else's. We're going to do whatever it takes to find out [about] the subjects on the video," said Chief Roller.
Berg's mom, Hope, said she sees a resemblance. "It sounded like her, it looked like her. It gave me chills," she said.
A photograph of Lizzie Borden appears in the Lizzie Borden Bed and Breakfast, in Fall River, Mass., Wednesday, Aug. 20, 2008. The owner of the site of the 1892 double murder has filed a federal lawsuit to prevent a new museum and shop in Salem from using the name of the infamous former Sunday school teacher who was accused in the hatchet deaths of her wealthy father and stepmother. (AP Photo/Steven Senne)
Coroner Samuel R. Gerber of Cleveland, Ohio, who has investigated Cleveland's 12 "torso murders," examines a plastic dummy which he received in the mail, shown Feb. 16, 1939. "Somebody," he opined, "possibly the torso killer himself, is playing grim jokes on me." (AP Photo)
Bucks Row, now Durward Street, east London, where the body of Mary Ann Nichols, victim of Jack the Ripper, was found lying across the gutter. (Photo by Hulton Archive/Getty Images)
Elizabeth Short has become one of the most investigated murder victims in history. The aspiring actress' brutal murder has commanded Hollywood's attention for decades: Tinseltown theories about her killer are as common as celluloid. (AP Photo)
These are three victims of a killer who calls himself "Zodiac" and brags to police by letter of his deeds, in San Francisco and the northern California areas. Left to right: San Francisco cab driver Paul Stine, shot to death last Saturday; Cecilia Shepard, 22, student stabbed to death three weeks ago; and Bryan Hartnell, 20, who was stabbed but lived. (AP Photo)
Bloomfield Police Chief Robert Snell fields questions from reporters Thursday, August 1, 1975 about the mysterious disapperances of former Teamster president Jimmy Hoffa. Hoffa's family reported him missing after the ex-union boss failed to come home Wednesday night. Police in this Detroit suburb say they have no clues as to Hoffa's whereabouts. -- (Bloomfield Hills, Mich. (AP Photo)
Dian Fossey plays with a group of young mountain gorillas in Rwanda's Virunga Mountains in central Africa. She is one of a group of Anthropologists who study animals such as the gorilla. (AP PHOTO) 10/05/1982
Defendant John Henry Carpenter talks with his attorney Gary Fleischman in a Los Angeles courtroom, Ca., June 1, 1992. Carpenter, 64, was arrested for the 1978 slaying of his friend and actor Bob Crane of the television show "Hogan's Heroes." Carpenter was acquitted of these charges by a jury in 1994. (AP Photo/Douglas C. Pizac)
The site where 6 year old JonBenet Ramsey was killed in Boulder, Colorado, 1996. (Photo by Karl Gehring/Liaison)
** FILE **Rap star Tupac Shakur spits in the direction of reporters as he leaves state Supreme Court in New York, in this July 5, 1994, file photo. Shakur died on Sept. 13, 1996, the victim of a drive-by shooting. (AP Photo/Bebeto Matthews/FILE)
UNITED STATES - JANUARY 18: Rapper Notorious B.I.G., aka Biggie Smalls, aka Chris Wallace rolls a cigar outside his mother's house in Brooklyn. (Photo by Clarence Davis/NY Daily News Archive via Getty Images)
Donna Norris poses next to a photo of her daughter Amber Hagerman, January 4, 2011, who was kidnapped 15 years ago while riding a bicycle near Norris mother's home in Arlington, Texas on January 13, 1996. (Richard W. Rodriguez/Fort Worth Star-Telegram/MCT via Getty Images)