Fellow resident Judith Wright said she saw Ms Cameron walking towards the facility's administration building shortly before 4:00 on Tuesday, the day she disappeared.
A search and rescue team has found clothing, a walking stick, and "biological matter" suspected to be human remains near a crocodile-infested creek in Port Douglas, north of Cairns.
Ms Cameron's devastated family conceded they were of the "firm belief" Anne had "passed away in tragic circumstances" as they waited for DNA testing to come back.
Police believe Anne Cameron, 79, became disorientated after leaving her aged care facility in Port Douglas, north Queensland, and wandered into dense mangroves.
"We still hold out hope that we will find this missing person alive".
The Mowbray River is the location of three sizeable crocodiles regularly seen by motorists travelling between Cairns and Port Douglas.
Cameron was last seen near an OzCare Aged Care facility at Craiglie on Tuesday afternoon.
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"I do believe she suffers from dementia, it has happened previously with her and she has sought the assistance of members of the public to be returned back to Ozcare", he said.
Acting Inspector Lukin said given the proximity of the clothes and remains, police could not rule out the possibility of a crocodile attack.
The Department of Environment and Heritage Protection said wildlife officers were assisting police with the search for a crocodile in the area.
The forensic tests should be completed by Friday morning, and police and SES are continuing to search for the missing woman.
Clothing and a walking stick bearing Mrs Cameron's name had also been found near the river.
The woman's son, Craig Eggins, wrote on Facebook his mother took regular short walks and would ask for help if she got lost, according to the Australian Associated Press.