Kelyan Bokassa was last seen in the town centre area shortly after 10.30am on Monday 3 April 2023.
The 12-year-old is described as around 5ft 3ins tall with black hair and silver stud earrings in each ear.
He was reportedly wearing a dark grey tracksuit, a grey zip-up top, black trainers and a brown bandana when last seen.
It is possible Kelyan has travelled to the Greenwich area of south-east London.
Anyone who has seen him, or knows of his whereabouts, is urged to call 999, quoting reference 03-0363.
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