The former Rutherford College student liked his own company, she said.
There were no suspicious circumstances, police said.
Detectives and coronial inquiry officers had been on the scene since he was found at 5pm yesterday near Kwinana Freeway in Bertram, Perth.
Tributes have been posted on Facebook this afternoon, with one person posting "sending out much love and heartfelt condolences to the Poe family".
Another said "rest in Peace mate. Hope you guys are coping alright".
Poe was last seen near a Coles Distribution Centre at Perth Airport on Wednesday September 6.
His vehicle was found the following day, also in the suburb of Bertram.