Police were looking for other parts of Choi's body, after the discovery on Friday. They also found a meat slicer and an electric saw at the scene in the rural Tai Po district, according to a police statement.
Local media, including broadcaster TVB and the South China Morning Post reported on Sunday evening, citing police sources, that Choi's head was discovered in a soup pot in the village house where she was found.
The gruesome murder of local influencer Choi, who recently appeared on the digital cover of L'Officiel Monaco fashion magazine, has gripped local tabloids.
Those charged with Choi's killing included her ex-husband, Alex Kwong, Kwong's brother Anthony and their father Kwong Kau, police said. All four were denied bail, the court ruled.
Choi disappeared on Tuesday and was last seen in the Tai Po district, where she was found, police said.
The court adjourned a hearing on the case to May 8.