The three reports, compiled by the Rugby Football Union, the Rugby Players' Association and the Aviva Premiership clubs, have all been leaked with excerpts published in The Times this week. Recommendations from all the reports are being collated and will be put to the RFU's management board on November 30.
But it has emerged Haskell declined to fill in the RPA survey and be interviewed by the players' union because he had no faith in his comments remaining confidential.
RPA chief executive Damian Hopley branded the leaking of the RPA report as the sport's lowest point in this country.
Shontayne Hape also refused to take part as he was not comfortable with being asked to rake over the coals and criticise his team-mates.
The RPA's report contains allegations that the England management pressured Haskell, Chris Ashton and Dylan Hartley into paying nearly £15,000 in compensation following an allegation of sexual harassment.
Annabel Newton, who worked in the team's Dunedin hotel, had allegedly threatened to sell her story to a newspaper unless she was paid NZ$30,000 (£14,350).
England manager Martin Johnson said on Friday that the players were told to seek external legal advice and that paying up was only one of the options presented to them.
The players refused to pay, with one of them quoted in the report as saying they "hadn't done what she claimed we had done", and engaged their own legal representation. Haskell and Ashton were given a £5,000 suspended fine by the RFU on their return from New Zealand. Hartley was cleared.
Haskell has now engaged a defamation specialist and is taking legal action. It is understood that a lucrative contract with a Super 15 franchise was withdrawn from the table as a direct result of the allegations.