Wenny Ooi, 27, said thieves hit her family's stall in Guar Kepah on the Penang mainland on June 25 and again on June 29, she told The Star on July 9. They were the first break-ins in the business's six years.

Two baskets of Black Thorn vanished in the first raid, though surveillance footage caught only one intruder leaving with a single basket.

"Four days later, at about 1 a.m., my stall was broken into again. This time, the thief was armed with a knife but left with only a basket of spoiled durians," Ooi told The Star.

Her family has since added more guard dogs.

Black Thorn ranks among Malaysia's priciest durians, prized enough to have dethroned the better-known Musang King at national competitions. Known in Penang Hokkien as Or Chi and registered by agriculture authorities as D200, it traces to a single mother tree still standing on the Penang mainland.