The FBI said it was asking the public to help identify suspects connected with the original theft and a more recent scheme to extort money from the owners of the red sequined shoes, one of four pairs worn by Judy Garland, who played Dorothy in the 1939 classic.
"Dorothy’s slippers are a treasured piece of Americana, and we are hoping members of the public can help us better fill in the details that will finish the script of this mystery so we can hold accountable all those who were behind the scheme," Jill Sanborn, special agent in charge of the Minneapolis bureau of the FBI, said in a written statement.
The slippers, known as the "traveling pair," were stolen from the Judy Garland Museum in Grand Rapids, Minnesota, during a "smash-and-grab" robbery during the overnight hours of Aug 27-27, 2005 that took less than a minute and left behind only a single sequin.
They remained missing for the next 13 years despite an exhaustive investigation by local law enforcement that included a search of abandoned ore pits.
In 2015 an anonymous fan of the film offered a $1 million reward for their safe return.
After their recovery, the slippers were sent to the Smithsonian National Museum of American History in Washington, DC where conservators studying construction, materials and wear patterns of the slippers were able to confirm that they were the missing pair.
"We were confident this day would eventually come, and we are grateful to the FBI and all those who worked to bring this piece of cinematic treasure out of the shadows and into the light," Grand Rapids Police Chief Scott Johnson said in a written statement.
Garland, a native of Grand Rapids who was born Frances Ethel Gumm, was best known for her role as Dorothy in the film.
"After all, 'There is no place like home,'” the chief said, echoing one of Dorothy's most famous lines.