Thames Valley Police is re-releasing the appeal to locate Kwame Agyapong who has gone missing from Milton Keynes.
Kwame, aged 16, was last seen in Stantonbury on Wednesday 28 July at around midday.
He is black, 5ft 8ins tall and has a medium build. His hair is black and styled into dreadlocks and the sides are shaven. However it is not known what he was wearing when he was last seen.
Investigator Kirsten Medland, of Milton Keynes police station, said: “We are appealing again to the people of Milton Keynes and beyond for help in locating Kwame, who was last seen on 28 July.
“Kwame is known to frequent Stantonbury, central Milton Keynes, Shenley Church End and also Crownhill. I would urge residents of these areas to please think about whether you have seen Kwame, to please make contact with us.
“You can make reports via our online service which can be accessed here. Alternatively, you can call 101. Please quote reference number 43210337439 when making any reports in relation to this matter.”