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Unfortunately there is really nothing you can do other than wait and perhaps call your ex-employer. By Law they have to give it to mail it to you by February 1, 2016.
See link here for support of the due date - http://taxes.about.com/od/Federal-Income-Taxes/qt/tax-deadlines.htm
So the best you could do is to call and ask if they could possible email you the W-2 or if you could pick it up in person.