I'm guessing it was "reported" by another official, and the language of such things is that it forms a "complaint".
I'm not excusing the "incident" (it seems logical and common-sense that coaches not approach refs during games for any reason) but I think it is probably being blown up into something that it is not. A question was asked, it was answered and that was that, from what is being reported.
The penalty count in each half is a red-herring - maybe all games with significantly different penalty counts in each half should be collated to see if any of the "data" is meaningful. A statistician's wet-dream, no doubt.
The most ridiculous extrapolation I've seen is linking the Kaino YC somehow to this.
For the amount of times I've read here that refs are manipulated or even intimidated by the All Blacks and McCaw, to not see how a coach going into the refs room at half-time to discuss his rulings or interpretations is a blatant breach of rules of the game and a very bad look for the game is a joke.
Both Cheika and Peyper should be punished because regardless of whether that conversation had any bearing on it or not, the penalty count swung massively afterwards with also a very poor call on the yellow card.
Apparently the Blues felt that there was definitely a change in the way Peyper ruled in the 2nd half even before they found out about the little chat.
I'm not saying that there was any match-fixing or anything going on but there were probably some 'ridiculous extrapolation' going on before Hansie Cronjie and Lance Armstrong were found out. In this day and age you simply cannot allow this kind of look for a professional sport to go unchecked and unpunished. And then be surprised one day when you find out about game fixing or game tampering in our sport....