Please make sure that you logged in with the same Origin account you used before and check the "Show:" tab in your Origin games library. Make sure it is set to "Show: All Games".
If you are still not able to locate your game, please get in contact with one of our Game Advisor for a further account investigation: http://help.ea.com/en/contact-us/new/?product=battlefield-2142
Please keep in mind that they will need some of your data for their investigation process.
Cheers
Basti
