The 32-year-old, also known as ‘Baz’ or ‘Big Man’, was last seen in September 2013 after he is believed to have been involved in an altercation.
Mr Olugbuyi’s body was found by litter pickers in the hedgerow beside Billing Brook Road on January 26 this year.
A murder enquiry was launched following the discovery of the body.
Two men, aged 43 and 29, from Northampton, were arrested in February on suspicion of murder and released on bail pending further inquiries.
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A police spokesman said the investigation into Mr Olugbuyi’s death is continuing and anyone with any information is asked to contact Northamptonshire Police on 101.
Alternatively, they can contact independent charity Crimestoppers on 0800 555111.