CAMBRIDGE (CBS) – Harvard University police are looking for a man who made off with 500 to 600 pounds of old X-Ray film.

Police say the man showed up at Harvard posing as a worker from EVOLVE Corporation, a company that recovers old X-Ray film and made off with the large load of film.

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According to investigators, the old film contains silver and can be refined to extract the silver.

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One X-Ray recycling company CBSBoston.com spoke with said the silver in the film could be worth as much as $700.

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Police posted surveillance photos of the suspect on MassMostWanted. They are asking anyone who recognizes the man in the photo to contact them.