The person pmed me about purchasing the domains. I in my second or third post that they were used as an example.
I'm guessing its probably how you approach them with your concern. Check out this video by google: http://www.youtube.com/watch?v=G959-2RlPyA
Sand box is just a term .. named.. when google does not index your domain name.. just because he finds... some unusual things happening to promote that name... just wait for a little time... and do proper SEO and see it all happening your self.
Not to be off topic, but what gets a domain banned from Google? It interests me quite a bit actually and probably good to know. I've had sites reported several times and even search results ommitted but never had a domain banned.
If your site does not adhere to the google webmaster guidelines, it will get pushed back in the rankings or maybe even banned. You can always use site:mydomain.com in google to check whether it is still indexed.