On 22 December 2012 The Australian published this  story:

You don't really need to read beyond the headline to get the jist of that story.   Trio's top of mind recollection was that Thiess paid $300,000 to Wilson's fund.   Not that Thiess was delivered a finely tuned training program by Wilson.  $300,000 was .5% of the anticipated total contract value, a nice round figured bonus paid to the person who was instrumental in having the contract awarded to Thiess by the WA Government, Bruce Wilson.

Here's Bruce Wilson in his own words with Nick Jukes' responses - all handily set out in one sworn document, courtesy of the Royal Commission.  I think it's fair to say that Counsel Assisting is on to them.

Nick was emphatic in setting out who he was dealing with in that letter, even capitalising the A in Association.

When Bruce went to Melbourne and Thiess got the deal with Melbourne Water, new payments to the AWU WRA followed soon after.

It will be interesting to hear how Mr Jukes explains this next step when Wilson introduced a new entity, the National Construction Branch - based out of the same secret PO Box in Perth. 

"Two Versions Trio" won't be much help - this report from The West Australian from the time sets out Joe's initial and then revised recollections.