Shailer had been convicted six times before she was jailed for her part in Moko's death. Her first offence was not until 2012. All of her convictions were for shoplifting.
The Herald was granted access to parts of Shailer and Haerewa's court file by Justice Sarah Katz.
Previous applications were declined, however as the pair have now been sentenced Justice Katz ruled that parts of the court file could be released to the Herald.
Shailer and Haerewa were sentenced last Monday.
They both pleaded guilty to manslaughter and ill-treating a child. They had originally been charged with murder.
Justice Katz said their sentence was the highest sentence imposed in New Zealand for manslaughter of a child.
Moko was assaulted over a two-month period in Taupo last year after his mother, Nicola Dally-Paki, left him with a couple while she was in Auckland looking after another child in Starship hospital.
Crown Prosecutor Amanda Gordon had asked for the maximum penalty of life imprisonment for Shailer.
She said the totality of the offending made it one of the worst cases of manslaughter imaginable.
Justice Katz said that while the court accepted there was a range of reasons Tania Shailer and David Haerewa struggled to cope with their circumstances, other families in similar situations did not brutalise and kill the children in their care.