"It was obviously disappointing, but there was nothing I could do about it. All I could do is look forward to this season.''
Williams was named last year's International Player of the Year during the tournament but could do little as Australian steamrolled the Kiwis 34-2 in the final.
Harris is hopeful of making the Kiwis side for this year's Anzac test in Sydney when Stephen Kearney takes the team for the first time since being reappointed coach. An announcement on his reappointment is expected in the coming days.
Meanwhile, halfback Shaun Johnson has admitted he received a number of offers to switch codes to rugby union before re-committing to the Warriors.
A handful of rugby clubs in Europe reportedly sounded out Johnson, who was named MVP of last weekend's Auckland Nines, but he knocked them back. He was also courted by Penrith and the Bulldogs before signing on with the Warriors until the end of 2017.
Johnson had previously expressed some interest in playing rugby sevens at the 2016 Olympic Games, which would have necessitated a switch to rugby.
"The Olympic dream was very brief,'' Johnson told the Herald on Sunday recently. "I learned that straight away. [Sevens] was a sport I loved to watch and it would have been cool but I am very happy with my decision and not thinking twice about it. It would have been a major commitment [to switch to rugby] and there was no chance of that happening; fifteen-a-side doesn't have the same appeal for me as league does, that's for sure ... and the Olympics thing got blown out of proportion.''