It is the official declaration of their marriage, on 5 January, 2004 at the Toronto town hall, Canada.
"We've got this beautiful wedding certificate, that if we had a boy and a girl's name on it would be accepted," Mr McCheyne said.
The couple's marriage flies in the face of Australian government policy, although an increasing number of Commonwealth and European countries have legalised same-sex marriages or civil unions including, most recently, Britain.
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Photo: Simon Schluter
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And despite their legal Canadian marriage, both men, who have been in a relationship for eight years, said they would exchange vows again if the right was afforded in Australia.
"It's very important," Mr McCheyne said. "We watch all of our Commonwealth neighbours — Britain now has civil unions, New Zealand has civil unions, Canada has full marriage, South Africa's about to follow with full marriage — and we've gone backwards."
Although a handful of Liberal backbenchers recently spoke out in favour of gay marriage and the Democrats wrote to the Prime Minister in support of it only last week, the key figures in the main parties oppose it.
Treasurer Peter Costello recently told The Sunday Age he would not support same-sex marriage. "I respect people who have long-term same-sex relationships," he said. "I know a number of people who have, and I respect them, but I wouldn't change the traditional and legal understanding of marriage."
And the shadow attorney-general, Nicola Roxon, was a vocal opponent of gay marriage when the Government rushed through changes to the Marriage Act in the Senate in 2004, ensuring that marriage would be recognised only if it was between a man and a woman.
But before this occurred, the newlywed Mr McCheyne, now 35, and Mr Tuozon, 32, felt ready to conquer the world. After their nuptials they launched, with a lesbian couple, a bid in the Family Court to have their marriage recognised in Australia.
One week before their hearing was to begin, the law was amended and the couples were forced to abandon the case.
Mr McCheyne said he could not understand why, in an age of political correctness, government is still allowed to discriminate against members of its society.
"You can't publicly put down Aboriginal people any more, or women, or be racist, but you can still say things to a same-sex-attracted person like 'you're a bit weird, a bit out there, you're not a valuable person in our community, and your relationship is dodgy'."
As a civil celebrant and former Christian cleric, Mr McCheyne has a deep respect for marriage as an institution, and said he believed homosexuals were "breathing new life" into it.
"Let me tell you, same-sex couples are revolutionising the institution of marriage," he said, "because there's no ownership of the other person, there's no expectation to get married. It's equal; one gender doesn't dominate the other, and they're creating things out of scratch.
"They're marriages but they look a little bit different. They're just awesome."
And it was for this reason that he and Mr Tuozon went to Canada to officially confirm a union that they had publicly committed to in front of family and friends in Melbourne four years earlier.
"I think the main thing is that people see us as one unit now," Mr Tuozon said. "Even our nieces and nephews see us as Jason and Adrian."