We've received a lot emails with the same question: Am I supposed to include a return address or take credit for this package?
The answer is an emphatic "Yes!"
If we do this again (and, I have to confess, everything seems to be going well enough that a second Exchange is looking more and more likely), we will open the game to anyone who wants to play, and rework the matches, so it is highly unlikely that you will have the same recipient a second time. Also, we are encouraging you to blog about your package, and perhaps thank your sender. If you don't have a blog, maybe you'd like to send an email of thanks to your sender.
So yes, include your info, of how you'd like to be known, your email address, even your blog address. Happy hunting!