"His car, a gold Mazda MX5 convertible, was found by police yesterday evening on a back road near Tapawera," he said.
Olds said an initial search of the area had not revealed any sign of Robinson.
While police were not treating the disappearance as suspicious at this stage, it was "out of character" for Williams.
"We urge Mr Robinson to contact police as soon as possible. We would also like to hear from anyone who has seen Mr Robinson or had contact with him since Friday morning - or who knows anything about his whereabouts," Olds said.
Anyone with information is asked to contact detective constable Olds on (03) 3739220, or Christchurch police on (03) 3637400.
- nzherald.co.nz