Officers investigating an alleged fraud involving hundreds of thousands of pounds at Stuart Porter Anqitues in Stamford have appealed for dealers who rented space at the business to come forward.
The investigation was launched in August after the Broad Street firm closed suddenly and Mr Porter disappeared.
Last month police arrested three men aged 54, 30 and 33 and a 19-year-old woman in the Stamford area plus a 58-year-old man and a 51-year-old woman in the North East of England in connection with the alleged fraud. All six have been released on police bail.
Officers now want to speak to any antiques dealers who rented space at Stuart Porter Antiques.
Det Sgt Jen Lovatt said: “We have been contacted by hundreds of people who are anxious to know if their property has been recovered.
“We aim to reunite as many items as we can with rightful owners but plead for patience in the meantime as we carry out the complex enquiry”.
Call 101 and ask for extension 3360.