Bao was last seen alive on July 19, when she arrived at a house for sale on Trevor St, Hornby, set to show a potential buyer through it.
A week later, her disappearance was upgraded to a homicide investigation.
Since then, police have appeared to focus their efforts on the Halswell River and Greenpark using search experts over ground, water and in the sky.
About 20 emergency service staff are there including Fire and Emergency New Zealand and police. They appear to be focusing on a pond on the property.
Detective Inspector Nicola Reeves confirmed police were in the Greenpark area as part of the ongoing investigation. Fenz was assisting with the search.
A 52-year-old Bryndwr man has been charged with allegedly murdering Bao.
Through a defence lawyer, the man entered a plea of not guilty to the charge of murder, as well as denying the charge of kidnapping at his first appearance on the charge.
He was remanded in custody and has interim name suppression. He will appear in the High Court at Christchurch on September 1.
Police are seeking the tracksuit pictured in relation to the investigation. Photo: Supplied
Police reveal search for tracksuit, spade
Police investigating Bao’s disappearance earlier appealed for information from the public in relation to a tracksuit, top, and spade.
“Police believe the items have been discarded in the Christchurch area sometime from approximately midday on Wednesday, July 19, to about 5pm Saturday, July 22,” Reeves said.
“The spade is brand new.
“Anyone that saw someone acting in an unusual manner or can assist police in locating the whereabouts of the tracksuit, the top, and spade, is asked to please to contact police.”
Reeves said police were “committed” to locating Bao and returning her to her family.
“There’s brilliant information from the public.”
The officer in charge of the search for Operation Helo, Detective Brent Menzies, earlier told the Herald a “significant amount of time and resource” has been put into the search and there was no plan to pull back.
“Everyone recognises the importance and everyone is sticking their hands up to help.
Bao’s family earlier issued a statement thanking family, friends and the general public for the “outpouring of kind words and unwavering support following the disappearance of their beloved wife and mother.
“The love and compassion displayed by fellow New Zealanders has been truly humbling, and the Bao family cannot express how grateful they are for all the generous donations made through Givealittle.”
“The family urges anyone with information that could assist the police in locating Yanfei to come forward as soon as possible.
“Their only desire is to have her returned to them, so they can find closure and begin the grieving process.”
“Go home tonight and tell all those you hold dear that you love and cherish them,” Bao’s husband Paul Gooch said.
Police remained interested in any information relating to sightings of a silver Mitsubishi sedan with the registration DPH101, particularly on July 20, the day after Bao was reported missing.
Bao was last seen about 10am on Trevor St in Hornby, where she was due to show a potential buyer through a home.
Anyone who saw Bao’s silver Nissan Dualis after 12.30pm and before 10.45pm on the day she disappeared is urged to contact police, she said. The car was seen on CCTV footage in Hornby’s Trevor St, where police forensic scene experts have been examining a house.
Anyone who had seen Yanfei Bao, or had any information about where she could be, is urged to call 111 immediately and quote event number P055385539.
By Sam Sherwood
