i have seen spiders, cinnies, lemons etc. on craigslist. Just because they're community savvy enough to have gotten a snake of decent lineage doesn't mean they are fully aware of things like BPnet and KS. *shrug* I don't think it's that weird or unlikely. Maybe they are just trying to reach a more local market??
I'd be pretty cautious about it anyway, like any other CL dealing, but i would hesitate to declare the whole thing bogus.