I got a W2 from an employer who never paid me.

You may want to send that employer a Registered Letter stating that you never received the wages reported on the W-2, and asking for a Corrected W-2.  Save a copy of the letter, as well as proof of employer receipt, so you can furnish the IRS this information if you don't receive a response by the end of February.  

If by the end of February, your Form W-2, Wage and Tax Statement has not been corrected by your employer after you attempted to have your employer or payer issue a corrected form, you can request that an IRS representative initiate a Form W-2 complaint.  Call the IRS toll free at 800-829-1040 or make an appointment to visit an IRS Taxpayer Assistance Center (TAC). 

• The IRS will send your employer a letter requesting that they furnish you a corrected Form W-2 within ten days.
• The IRS will send you a letter with instructions and Form 4852, Substitute for Form W-2, Wage and Tax Statement, or Form 1099-R, Distributions from Pensions, Annuities, Retirement or Profit-Sharing Plans, IRAs, Insurance Contracts, etc. You can use the Form 4852 in the event that your employer doesn't provide you with the corrected Form W-2 in time to file your tax return.

Here's more info about Incorrect W-2's.