"We're waiting for our forensic people to be able to download all the phones that were given to them.''
Mr Scott said police were interested in both still pictures and video of the fight.
"Whatever might be there, we're looking for. Several people have indicated that there were others who were videoing, but haven't named anybody, so that's why we've taken the phones.''
Mr Scott said witness reports had been consistent so far, and video footage should confirm their stories.
Police have spoken to about 30 witnesses.
"We've spoken to everybody that we think we need to speak to at this stage.''
Police were also awaiting toxicology and post-mortem results.
Stephen's funeral will be held tomorrow at Kelston Intermediate, where his father Brent Dudley is a caretaker.
