Attempts are being made to retrieve more than £6m from a man jailed for his part in a £49m heroin smuggling plot.
Waheed Khalil, of Selborne Terrace, Shipley, was jailed for 18-and-a-half years after admitting conspiracy to illegally import the drug in 2014.
A judge at Leeds Crown Court decided he had made £6,181,250 from his criminal activities. He only had £7,540 to pay back at the time
An appeal has been made to get back the outstanding £6,173,710.
Crimestoppers wants to hear from anyone who knows of any new assets Khalil may have.
Khalil was one of three men jailed over a plot to smuggle 245kg of heroin into the UK hidden in a consignment of towels.
A National Crime Agency investigation found Khalil, his brother Yasser Khalil and Stuart Maich conspired to import the Class A drug from Pakistan using a legitimate company set up as a front for drug trafficking.
In 2012, Border Force officers at the Port of Felixstowe searched a sea freight container from Port Qasim.
It contained 592 cartons of towels, 124 of which had been modified to hide 2kgs of heroin inside.
A spokesman for Crimestoppers said: "If anyone knows of any new assets that Waheed may have please get in contact with us, either anonymously online or by phone."