Hmmm, White Dog. Lots of people looking, no answers, huh?
Here is my take. I would not want to take a chance of shipping open samples through the mail anyway except priority. That is because you can't depend on prompt delivery, or know how the mail was handled, as to high temps etc.
Therefore the only way I would do it would be Express mail, which is expensive. Probabaly just as cost effective, and safer, to just let your team-mate buy the stuff in his home town. Unless it is awful, it can be used, somehow, so is not a complete waste.
Just my .02