Police said officers would continue to support the coroner with their enquiries.
Det Supt Adam Edwards said: “Officers have worked tirelessly to investigate the disappearance of Simon Parkes, and to find answers for his devastated family.
“The full circumstances surrounding Simon’s disappearance still remain unknown, however police will continue to support the ongoing coronial process.
“As with any cold case, no case is ever closed indefinitely – if we get new information that offers new and legitimate investigative opportunities then we will take further action.”
Mr Edwards said officers were still keen to hear from anyone with information.
He said: “I know it was a long time ago, but if there is anything you remember being strange or out of place please get in touch.”