I've started taping the heat pack to the top piece of foam, rather than the bottom. Heat rises (and thus the reason I tape it to the top, so that the snake isn't having heat rise from beneath hit), but the insulation does help to hold heat in. I also have a layer of the polyfill between the heat pad and the animal itself, in case the box is set down upside down during shipping for any reason.
I also would err with no heat in a slightly "warmer" situation, even with cooler night temps, especially with babies, who I've been told are less susceptible to developing a RI in a short period of time (ie, time it takes to ship) than an adult would be. I'd much rather them be a little cool to the touch where they can be immediately set up in an enclosure with proper heat upon arrival, rather than to arrive overheated and with possible neurological problems as a result.
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