After you file

TurboTax does  not keep a copy of your W2 forms.   

You will either have to contact your employer to request a copy or get a tax return transcript from the IRS:

Transcript

• You can get a wage and income transcript, containing the Federal tax information your employer reported to the Social Security Administration (SSA), by visiting our Get Your Tax Record page. Refer to Transcript Types and Ways to Order Them and About Tax Transcripts for more information.
• You can also use Form 4506-T, Request for Transcript of Tax Return. Check the box for Form W-2, specify which tax year(s) you need, and mail or fax the completed form. Most requests will be processed within 10 business days from the IRS received date.
   

IRS Transcript or Copy of Form W2