Police have been making inquiries to the whereabouts of missing Hamilton Freedom Davis for weeks.
The 13-year-old was first reported as missing to police on May 12 - but then seen by a family member the next day.
A police media spokesperson said police have undertaken a range of inquiries since he was reported missing before deciding to this morning ask the public for help after almost a month.
"We are now at the stage where a public appeal for information is the appropriate next investigative step."
Police made decision on when to publicly release information about missing people on a case-by-case basis depending on the particular circumstances, the spokesperson said.