Google this – site:sandbox.google.com – and you will find some interesting links. Dont know how helpful that will be but I found a service name coded "re"

Kinda old news. What you might be interested in though is what Tony Ruscoe found out about the sandbox domain http://blogoscoped.com/archive/2006-07-28-n84.html & http://ruscoe.net/blog/2006/07/whats-in-googles-sandbox.asp