In his closing arguments this afternoon, Crown lawyer David Johnstone said various travel documents, including an application for New Zealand citizenship, contained false information or left information out to hide another identity.
He said although Yan himself was not likely to have filled out the forms himself, he must have known they contained untrue information because he later used them to travel overseas.
Mr Johnstone said the applications in two different names with two different dates of birth made no reference to the other identity.
"That level of deception amounts to dishonesty.''
But Yan's lawyer David Jones QC said both passports were issued by the Chinese authorities legitimately because his client was adopted.
He said the omissions and mistakes in the applications were made by other people on Yan's behalf and Yan knew nothing of them.
"What we have is simply a person who leaves such things to others.''
Earlier today, the court heard from Shane Phillips who worked as a fundraiser for the Labour Party and introduced Yan to former Labour Minister Rick Barker.
Mr Phillips, also known as Shane Te Pou, told the court he met Yan at a Labour fundraising auction at Auckland's Viaduct in March 2005 that he helped organise.
He said he had a "fleeting conversation'' with Yan and later invited him back to a house for dinner and drinks with a handful of others.
"He, obviously to me, had a passion about politics ... particularly, to me, that we were able to vote.''
He said he saw Yan as a "man of success'' after visiting his apartment in the upmarket Metropolis building on Auckland's High St.
Mr Phillips said he and Yan flew to Hawkes Bay to look at the possibility of exporting New Zealand wine to China.
"I thought: `What would be helpful is if he looked for investment in the viticulture industry and we reached an agreement that I would be his agent.''
During their visit to the Bay, Mr Phillips called Mr Barker to their accommodation at Craggy Range. Mr Barker was Minister of Internal Affairs at the time.
Mr Phillips said Mr Barker was a "long-term work colleague'' and there was no link between seeing Mr Barker and Yan's citizenship status.
"I hadn't seen him for a while and I wanted to catch up.''
Mr Phillips later filled out Yan's citizen application form. He told the court he did not include Yan's other names because he only knew him as "Bill''.
He also wrote "n/a'' in the section that asked about legal investigations.
Mr Phillips confirmed to Yan's lawyer, David Jones QC, that he had "based that on an assumption'' and had not asked Yan.
Under cross-examination from Crown prosecutor David Johnstone, Mr Phillips said he began discussing the possibility of Yan getting citizenship after a dinner at one of Auckland's top restaurants, The Grove.
Mr Phillips said Yan paid for the meal and the pair agreed that Mr Phillips would do some "research''.
He said he got his information from the citizenship form from Yan, two of Yan's passports and information from Yan's partner.
Mr Phillips denied ever checking the information on the form with Yan.
Justice Timothy Brewer has reserved his decision and will deliver his verdict on Thursday.
