US police have stepped up the hunt for Mr Xue, wanted over the murder of his wife and who flew to Los Angeles after dumping his three-year-old daughter Qian Xun at a Melbourne railway station.
The body of the toddler's mother, Anan Liu, 27, also known as Annie Xue, was found this week in the boot of his car outside the family home in Auckland.
Superintendent Neville Matthews, the New Zealand police liaison officer in the US, says several American law enforcement agencies, including the Federal Bureau of Investigation (FBI) had thrown a large level of manpower and resources into the search.
Mr Matthews says the Americans "had put a considerable amount of effort, much more than we could ever have hoped for, into locating this person".
The hunt was being coordinated by the US Marshal's Pacific South West Fugitive Task Force – which combined several law enforcement agencies.
‘We’ll get him’
"The whole case has certainly captured the law enforcement community over here, certainly in the Los Angeles area, and they really want to get this guy."
A provisional arrest warrant was likely to be signed, if it had not already been signed, but that was not needed to get the cooperation of the American authorities, Mr Matthews says.
"It was amazing and their effort has been absorbed into the task force.
"The FBI was in touch with me and they offered to put four teams (each with five or six agents) out of the Los Angeles area onto this also – a very large commitment.
"It really has been an incredible amount of cooperation. I can't say enough about the excellent cooperation we have received."
Mr Matthews says American authorities had thrown such a high level of resources into the search in part because it was not a run of the mill case.
"Law enforcement officers are human and they are thinking,'Gee, that was a terrible thing, let's go out and see if we can get this guy'. And that has permeated right through in the talks I have had with the officers involved.
"It has become almost a personal thing – let's track this guy down and let's do it as quickly as we possibly can."
Media gets involved
National and global news agencies were running the story and Mr Xue's photograph had been published on the front page of Chinese newspapers in Los Angeles.
"The obvious message I would have for him is that it is time now to turn yourself in to the nearest police authority and take the matter from there because you will be found.
"I have got the utmost confidence he will be found."
Mr Matthews says the Interpol "red notice" issued at New Zealand's request showed he was suspected of murder, had fled to America and every police agency needed to be on the lookout for him.