An anonymous donor has offered a million-dollar reward for information that could lead to the return of a stolen pair of Judy Garland’s ruby slippers from The Wizard of Oz.

John Kelsch, executive director of the Judy Garland Museum in the actress’ hometown of Grand Rapids, Minnesota, told the Associated Press the donor is from Arizona and is a huge fan of Garland and the 1939 movie.

The slippers, worn by Garland in Oz, were stolen from the museum nearly a decade ago. Three other pairs still exist, including the one on display at the Smithsonian Institution in Washington. Another pair was acquired in 2012 by the Academy of Motion Pictures Arts & Sciences for its planned museum.

The reward offer requires the exact location of the slippers and the perpetrator’s name, the AP reports. The shoes were insured for $1 million, but Kelsch said they could now be worth $2 or $3 million.