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The distraught owner, an expert in antique bows and musical artisan, fears he left a bespoke brown case in the luggage rack as he travelled from London Liverpool Street to Ipswich on the afternoon of October 4. One of the bows is valued at more than £30,000 alone.

Detective Constable Alan Reed of British Transport Police said in a statement: "While these are extremely valuable items, it would be extremely difficult to sell them on to a third party. Anyone who works in the antiques trade or musical instrument business is asked to contact us if they are approached by anyone selling items that match the bows' description."