Since during shipping they can be in transit for over 11 hours, get handled by a bunch of people, and get exposed to extreme temp. spikes... I'd say treat them like you're shipping them and you'll be fine.

IE
Put them in something insulated like a cooler or foam lined box so the temps don't spike
Keep the snakes individually wrapped in small containers or bags so they can't hurt themselves
Hot/Cold pack if the temps anywhere along the way spike in a bad direction
Don't feed for a week prior so they don't poop all over themselves or regurg


GL