BOSTON (CBS) – Two valuable pieces of art are missing from the Boston Public Library.

The library’s president is hoping the pieces, worth more than $600,000, were just misplaced.

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“We recently discovered that an engraving by Albrecht Dürer and an etching by Rembrandt are missing from the Boston Public Library’s print collection,” Amy Ryan, President of the Boston Public Library said Tuesday. “It is our hope that these two significant pieces have simply been misfiled.”

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The pieces were reported missing last month. The library is currently undertaking an updated inventory of the more than 200,000 prints and drawings that make up the print collection.

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Library curators are working with Boston Police to determine if any crime was committed.