Domestic demand for specialty foods and an expanding Asian market for them have prompted a nut orchard boom in the state's agricultural heartland. Such heists have become so common that an industry taskforce recently formed to devise ways to thwart thieves.
"The Wild West is alive and well in certain aspects," said Danielle Oliver of the California Farm Bureau. "There's always someone out there trying to make a quick dollar on somebody else's hard work."
Amid the nut boom, farmers have torn out vineyards and other crops to plant nut trees to keep up with demand. Real estate firms, retirement funds and insurance companies have taken note by adding almonds, walnut and pistachio land to diversify their portfolios.
As the nation's top nut producer, the state grows more almonds and pistachios than any other country. Only China produces more walnuts, which have nearly tripled in price in the last five years to about $2 a pound, according to the California Walnut Board.
The U.S. Department of Agriculture reported that through 2012 the state's almond crop was valued at $5 billion per year, pistachios were over $1 billion and walnuts were over $1.5 billion.
"Right now, everybody wants to be a nut grower because it's kind of like the gold rush of the 1850s," said Ripon almond farmer Kevin Fondse of Fondse Brothers Inc. "Everybody wants the gold."
That frenzy has spawned crime. In a brazen heist in October, thieves made off with 140,000 pounds of processed walnuts from GoldRiver Orchards. The thief cut through wooden fence posts in the dead of night, hooked up a truck to three gondola trailers brimming with nuts and drove off.
In another incident, unemployed trucker Francisco Javier Lopez Martinez told investigators he couldn't pass up a job paying $180, despite his suspicions. He was hired in October by a man who gave him a fraudulent driver's license and told him to pick up 43,000 pounds of almonds at Sunnygem, a processing plant.
A transportation broker tipped sheriff's deputies that something seemed amiss. They arrested Martinez, who told them he was supposed to drive the load to a specified address in Los Angeles, park it and walk away.
The trucking firm that hired him turned out to be a fake. The company's logo was merely taped onto the side of the truck, and it had stolen license plates. Martinez pleaded guilty in December to commercial burglary and possession of fake identification. He was sentenced to 350 days in jail and three years of probation.
Authorities say this type of industrial identity theft, known as a "fictitious pickup," is becoming more sophisticated. It often involves con artists providing fabricated insurance documents and U.S. Department of Transportation numbers for trucks.
The driver presents the paperwork to the unsuspecting nut processor.
A walnut farmer suspected he had fallen victim to such a crime in March after a $250,000 load left his yard, so he called Detectives Pat McNelis and Matt Calkins at the Butte County sheriff's department. The detectives traced phone records to Los Angeles, where police there served search warrants and seized evidence. The investigation continues, detectives said.
"In our case, there's multiple levels of people that were involved in a complex crime," Calkins said. "This is an organized criminal enterprise. It's not one or two people acting on their own."
The California Highway Patrol investigates cargo thefts, but doesn't tally nut thefts separately. The CHP hasn't established a link between such thefts and any specific criminal organization, spokeswoman Erin Komatsubara said.