"The Australian tour chapter is now closed and we have finished our (internal) inquiry. We have found no evidence of any match-fixing during the tour," said Butt.
Australia won the Sydney Test by 36 runs despite conceding a 206-run first-innings deficit.
That result, part of a tour that featured a 3-0 defeat in the Tests and a 5-0 loss in the one-day series, prompted the PCB to hold its own investigation.
The board later banned former captain Younus Khan and Australia tour captain Mohammad Yousuf for an indefinite period, while former captain Shoaib Malik and Rana Naved-ul-Hasan were banned for one year and fined heavily.
Kamran Akmal, Shahid Afridi and Umar Akmal were also fined heavily, but no evidence of match-fixing was unearthed, the sanctions stemming from issues of conduct and "infighting".
Kamran dropped three catches and fluffed a run-out when victory was apparently in Pakistan's grasp in Sydney.
But he defended himself on Friday, saying: "I don't even think about these things, I just concentrate on my performances. I have always played for my country and I have already told the PCB about my performances in Australia.
Former Pakistani cricket captain Shoaib Malik was banned for one year
"Whoever is now making allegations is free to do so but must also prove them."
Lord Condon, whose role as chairman of the ICC's anti-corruption and security unit (ACSU) is to be taken over by Sir Ronnie Flanagan, said: "That has been an ongoing investigation since the time.
"It is a match and series that worried us, we spent a lot of time talking to the players and PCB. The challenge is finding where is the solid fact.
"What you have there is a lot of strife within the team and Pakistan politics with rivals camps making allegations.
"The dysfunctionality in the dressing room led to players not performing well, to maybe players potentially underperforming deliberately."
After 10 years in the role, Condon will hand over to former Northern Ireland police chief Flanagan when he retires at the end of June.
"My personal message is that if anyone is thinking about fixing, we will find them and deal with them," said Flanagan.
"My message is to forget about it. We exist to pursue rigorously the policy of zero tolerance on corruption. We cannot be complacent and I will not be."
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