Police are appealing for help to locate Benjamin, 39, who has been reported missing from Worthing.
He was last seen in the town on Sunday, 4 August, but officers believe he may have since travelled to Brighton.
Benjamin is described as 5ft 9in, with dark brown hair in a skin fade haircut, and has ear piercings. He was last seen wearing a yellow sweatshirt over a white t-shirt and grey tracksuit bottoms, though he may alternatively be wearing dark grey shorts.
His wallet was found by a member of the public and returned to his home address. Police are now working to establish exactly where it was discovered as part of their ongoing enquiries.
A Sussex Police spokesperson said:
"We are concerned for Benjamin’s welfare and urge anyone who sees him, or has information about his whereabouts, to contact us immediately."
Anyone with information is asked to call 101 quoting serial 295 of 10/08.
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