Oxley Police District crime manager, Acting Inspector Jason Darcy, confirmed the news to the Leader on Wednesday morning.

He said the man had been identified but "the name is not going to be released at this stage".

Acting Inspector Darcy said he was unable to comment on whether the man was a local or a traveller, or whether the incident was being treated as suspicious.

"We're conducting inquiries, and we'll provide a brief to a coroner and will know more once a post-mortem has been completed," he said.

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A passerby made the grim discovery at about 11.35am on Monday morning, finding the man's body inside a campervan at a rest area near Goonoo Goonoo Station on the New England Highway.

Police officers received a call from the passerby, and as a result launched an investigation.

Acting Inspector Darcy said on Tuesday afternoon that the body had lay undiscovered for days before this.

Police are now seeking information and dashcam footage from anyone who may have driven past or stopped at the rest area in the past few days.

Acting Inspector Darcy particularly mentioned the lack of a generator on the campervan, which was missing when police arrived at the scene.

First responders also noticed drawers inside the van had been opened.

Tamworth Police Station can be contacted on 6768 2999 or Crime Stoppers 1800 333 000.