I did a quick google search and found this method:
http://supportforums.blackberry.com/t5/BlackBerry-Bold/How-do-i-check-whether-my-BB-9900-is-refurbished-or-not/td-p/1698613
Which supposedly shows the data and voice usage on the phone since it left the factory. Is this a confirmed and commonly accepted method t confirming whether or not a phone I want to buy is new?
Options > Device > Device and Status Information > type "buyr"