A Picasso painting set to be part of a Spanish art exhibition has gone missing.

A transportation company charged with hauling art pieces from Madrid to Granada for an exhibition at the CajaGranada Cultural Center delivered all of the paintings except one: A small Picasso with a reported appraisal value of roughly $600,000.

Upon completing the 260-mile journey from the Spanish capital that began on Oct. 2, a delivery van arrived at the museum at 10 a.m. local time Oct. 3, according to a news release from the cultural center. Louvre heist in graphics: How thieves stole treasures worth millions from the Louvre Museum in just seven minutes

How did the piece go missing?

According to the cultural center's account of the incident, a manager greeted the transportation employees and instructed

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