Describing the theft of Rabindranath Tagore's Nobel Prize medallion as a shame, West Bengal Chief Minister Ms .Mamata Banerjee has said that given a chance, she could endeavour to retrieve the stolen prize. <br/><br/>She said, despite CBI investigating the matter, it could not retrieve it. The chief minister was speaking at an event at the Tagore-founded Visva Bharati University in Birbhum district's Santiniketan. <br/><br/>The sensational theft of the medallion and 47 other memorabilia from Rabindra Bhawan at Santiniketan in Bolpur came to light on March 25, 2004.<br/><br/>AIR correspondent reports, the investigation was handed over to the CBI which after three years of probe, closed the case in August 2007, only to reopen it in September 2008. Failing to make much of a headway, the agency closed the case again in 2010.