Officials say world's 'largest ever' seizure of about 7.2 tonnes of ivory has an estimated street value of $72m Authorities in Hong Kong have announced what they say is the world's largest ever seizure of about 7.2 tonnes of ivory tusks with an estimated street value close to $72m. If the size of the haul is verified, it will replace the current record held by Singapore for a seizure of 7.138 tonnes of ivory tusks in 2002.