The photo released of Mr O'Riley is the most recent, although police say at last sighting he had a moustache but not a beard.
Police are no longer seeking the maroon Honda station wagon CPS612 that Mr O'Riley was believed to have been driving, as it has been located.
Any sightings of Mr O'Riley should be reported urgently to police on 111.
Detective Wells said although Mr O'Riley is not believed to pose any specific risk to the public, he should not be approached.
Anyone with information can also contact Detective Wells at the Christchurch South Police Station on (03) 3637859.
Alternatively, to provide information anonymously contact Crimestoppers on 0800 555 111.