Download ___AWU WRA invoices and Thiess remittances  

It may be that there is no AWU-WRA invoice.   Wilson controlled other accounts and there were legitimate accounts operated by the AWU.   What I think can be inferred from Nick Jukes of Thiess's letter is that Thiess paid for "clearance to use contaminated landfill".  

http://www.michaelsmithnews.com/2012/09/the-awu-scandal-the-dirty-rotten-bastard-1.html

  Note that this was referred to Victoria Police by Ian Cambridge, but no action seems to have been taken.