extremely unlikely. Loxoceles reclusa requires a warm humid climate, only found in the southeast gulf states.
The only recluse species found in california is Loxoceles deserta, which is the only likely species, however because of the improper climate they also fail to establish, as well.
aberrant individuals, like the chilean recluse, which hitch-hike in produce, DO pop up from now and then, however because of the improper climate, they never establish.
Add to that, the pholcid spiders, which thrive indoors, and specialize in eating spiders that wander, and the possibility diminishes even more. Many spiders look extremely similar to loxoceles, and many "recluse" bites end up actually being MRSA infection, which resembles a spider bite, and can become necrotic. But when a chilean recluse shows up in produce from chile, expect the corporate media to jump at the chance to fear-monger.
Photobucket sucks. gotta re-host most of my images, now..