Few days ago i also tries a tools for checking weather the site is in Google sandbox of no, but that tools was worst. I think no any tool show you exact result about Google Sand-Box.
i very simple to chek my site from google sanbox I checked if the site if you want me exposed sanbox or not, My first check the url content articles, in a way example site: site.com/content.html, if there is no analogous indexnya sanbox affected, but if being indexed means exposed sanbox
its not working dear,.. its too funny,.. when i try to check google dot com,.. and it says,.. Your site is still in google Sandbox. LOL
i can't seen any Goolge sandbox checker tool but checking some related links for checking sandbox such as http://www.searchenginegenie.com/sandbox-checker.htm
Friends, Searchenginegenie says that almost all sites in sandbox including, google, olx & quikr etc & so on.... Check the screenshot below
Here is link of Google Sandbox checker tool. Please check your site. I have full tested it so no-doubt in it. http://pixelgroove.com/serp/sandbox_checker/