The 18-year-old who was arrested has since been released pending a report to the Public Prosecution Service.
The public prosecution service said the convictions should be quashed, but want their reasons to be kept secret.
In 2008, the police closed their investigations and the Public Prosecution Service directed that no prosecutions be brought.
Counsel for the Public Prosecution Service is expected to confirm on Wednesday whether it is seeking fresh criminal proceedings.
The Lord Advocate is the principal law officer of the Crown in Scotland, responsible for the system of public prosecution.
Two other men arrested over the murder, aged 19 and 32, have been released pending reports to the Public Prosecution Service.
Last year, the public prosecution service said the couple would not have been charged if it had been aware of confidential material it has now seen.
One carried out by the PSNI has been completed and the Public Prosecution Service has said there will be no prosecution in relation to that inquiry.
While police decide whether to prosecute before sending files to the CPS, the Public Prosecution Service will make any decision about court action at the earliest stage.
BBC: NEWS | UK | Northern Ireland | Prosecution service overhauled
Mr Baggott said he had "reminded the first minister" that decisions about prosecutions and bail were taken "independently" by the Public Prosecution Service (PPS) and the courts.
The men were arrested by Dutch border police shortly after their flight landed at Schiphol on Monday, said Dutch Public Prosecution spokesman Theo D'Anjou at a press conference.
The assets were revealed during the latest stage of the Public Prosecution Service's move to seize all of the convicted murderer's assets under the Proceeds of Crime Act.
BBC: Killer dentist Colin Howell has assets in five countries
The Public Prosecution Service is seeking a retrial in the case of three Ballymena men whose convictions were recently quashed for the 2006 murder of teenager Michael McIlveen.
But the head of Scotland's public prosecution service - Lord Advocate Frank Mulholland - hit back, questioning why Mr Cable had written to Lord Wallace rather than the Crown Office.
She said she was charged with insulting an official and then released after signing a document saying she would appear at a public prosecution office when requested to do so.
They called for the First and Deputy First Ministers to report on protocols on national security, the Serious Organised Crime Agency, the independence of the judiciary and Public Prosecution Service, and co-operation on criminal justice.
The three appeal judges were informed that letters of complaint are also to be sent to the Public Prosecution Service and the Law Society, amid concerns that covert surveillance may have been used against either the witness, his solicitor, or both.
Prosecution barrister, Frank O'Donoghue QC, told the court that having spoken to Mr Keenan's family, the police and the Director of the Public Prosecution Service, he had been instructed to accept Shang's plea to the lesser offence and not to proceed with the murder charge.
BBC: Suwei Shang pleads guilty to manslaughter of Damien Keenan
Chile, for instance, established a new public-prosecution system beginning in 2003.
He added he was "as frustrated as the public" that a prosecution did not take place.
He said he hoped performances of the play, both in Scotland and in Malta, would boost calls for an independent public inquiry into the prosecution of the case.
"The cases were all reported to the procurator fiscal and in each case the fiscal decided to take no action because it was not in the public interest for a prosecution to take place, " he said.
Last week, his lawyers said they would raise the issue of whether it is in the public interest to continue his prosecution.
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These sought to clarify when it would be in the public interest to bring a prosecution, placing increased emphasis on the state of mind of the individual wishing to end their life and the motivation of those seeking to help them do so.
The Crown Prosecution Service said a public order charge would be more appropriate but as this does not carry a custodial sentence it would not be in the public interest to proceed.
The deputy editor of the Sun, Geoff Webster, has been charged with allegedly authorising two payments to public officials for information, the Crown Prosecution Service has said.
BBC: The Sun's Geoff Webster charged over payments to officials
Providing another potential stick for Pena Nieto, Congress stripped lawmakers and other public servants of their longstanding immunity from prosecution, leaving only the president with total legal protection.
He said he would continue his campaign and hoped the jury's verdict would send a "strong message" to the police and Crown Prosecution Service that nakedness in public was not a crime.
It seems unlikely that both conditions could be met in an established and transparent democracy such as the United States without sparking a huge public outcry which would produce a domestic prosecution.
Five Law Lords unanimously backed Ms Purdy's call for a policy statement from the Director of Public Prosecutions on when someone might face prosecution for helping a loved one end their life abroad.
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