Mr Riley was declared missing about 3.30pm on April 14, sparking a large land and air search by water police, the coast guard, family, friends and members of the community.
A Facebook group dedicated to co-ordinating the public search for Mr Riley has more than 11,000 members.
Police search for Trent Riley in Moreton Bay. Picture: 9 News Queensland
Over more than a week, hundreds of people joined the search from the Port of Brisbane to search Moreton Bay and Mud Island for signs of Mr Riley.
The family called off the search on Anzac Day.
His brother Shannon Riley said in a video posted to Facebook on Sunday that calling off the search was the hardest thing he had done in his life.