"Once that file is complete, and the file is reviewed then a decision [on charges] will be made at that time.
"But I think the focus has been to make sure everybody was supported, that whatever they needed was wrapped around them because you know, we don't want another tragedy coming out of what was already a tragedy."
About 20 officers were still working on the case, he said.
"I wouldn't expect it to take too long, the Coroner will be interested in getting that file as soon as they can."
After reports that up to 600 people were at the party, Black said that had been narrowed down to about 300.
A clean-up day in the student area was held last weekend, at the request of Crestani's parents.