Why?

These will be hard to be fenced:
From the San Fran Chronicle: Authorities are trying to crack the case of a nut thief who made off with 140,000 pounds of walnuts.
The theft, estimated at nearly $400,000, occurred Sunday in the small Central Valley town of Escalon. Investigators say it was one of the biggest to hit the booming industry. Last month, about 12,000 pounds of walnuts worth $50,000 were stolen from a trailer parked on Highway 99 north of Sacramento.
This time several truckloads of walnuts were taken from the facility. Authorities say rising prices - about $2 per pound - are what appear to be driving the recent walnut thefts.
No arrests have been made.  http://www.sfgate.com/bayarea/article/140-000-pounds-of-walnuts-stolen-4965797.php
Umm, if the cops look for someone trying to sell 140,000 pounds of walnuts, they will probably find the thieves.