Hmmmmm... I don't have unzip installed, but I tried it in 7-zip (windows) and lo and behold, it's there.
Turns out it was hidden, forgot to check the obvious (windows default zip handler doesn't show it unless you have 'show hidden files/folders' on).
At any rate, I think I got it working... is it necessary to keep these lines in /boot/config/go, once they're installed, or can I remove them once I've rebooted once?
installpkg /boot/socat-1.7.0.0-i486-2bj.tgz (if you will be using Secure SMTP)
installpkg /boot/unraid_notify-2.30-noarch-unRAID.tgz