The chocolate-loving criminal got away with 384 limited edition white KitKat Chunkies, 288 packets of Rolos and a selection of other confectionery, which was boxed up in the back of a car.
The incident was part of a spate of thefts from motor vehicles in the Trelissick Fields area of Hayle last Wednesday.
Four secured and unsecured vehicles were targeted but none of therm were damaged during the incidents, which police belive took place between 4am and 4.30am on October 17.
St Ives Sergeant Mike Friday said he thinks the thief was an opportunist.
"It's about making sure that people do check that there is nothing on show and that their vehicles are locked," he said.
Sergeant Friday added that police are keen to hear from people who might have seen someone acting suspiciously, possibly looking into and checking the doors of cars in the area.
What the thief got way with:
384 Limited Edition White KitKat Chunkies
288 Packets of Rolos
96 Drifter bars
72 packets of Jelly Tots
72 packets of Fruit Gums
72 packets of Milky Bar Buttons
72 Milky Bars
72 Aero bars
36 packets of random sweets
And money, mobile phones and sat navs.
Anyone with information can contact police on 101, quoting crime reference number AY/12/855.