The Independent Broad-based Anti-corruption Commission will table its Operation Richmond special report in Victorian parliament on Wednesday.
The probe was established to investigate allegations of corrupt conduct during enterprise bargaining agreement negotiations between the state Labor government and the United Firefighters Union in 2016.
That same year, emergency services minister Jane Garrett quit after refusing to support a cabinet proposal to end a long-running industrial dispute with Country Fire Authority members.
The CFA became an entirely volunteer operation in 2020 after the Metropolitan Fire Brigade was abolished and replaced by Fire Rescue Victoria, the state agency for career firefighters.
Details on the investigation's exact scope and witnesses have been a mystery for years.
Former premier Daniel Andrews, who led the government at the time of the negotiations, was widely reported to have been called in for questioning.
Witnesses cannot confirm or deny they have been interviewed by the watchdog under Victorian law.
IBAC had indicated the final report would be published by July 1 until the firefighters union and state secretary Peter Marshall mounted a legal bid to prevent its publication in May.
They argued the watchdog was relying on certain powers to release the report that exceeded its legal authority, an argument the Supreme Court rejected.
The release of the report was again delayed to give the plaintiff's time to consider whether to appeal, but the July 17 deadline passed without one being filed.
The identities of Mr Marshall and the union were initially protected under a pseudonym order, but they were unmasked on June 12 following a failed bid in the Victorian Court of Appeal.
It determined the Supreme Court had not made an error in rejecting their original pseudonym application on the grounds the information was already in the public domain.
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