The W-2 worksheet in your tax file is not an official form...it is just a datasheet with info you either entered manually, or imported.
The "data" on the worksheet gets sent to the IRS...but if you choose to mail in your tax forms instead of e-filing, that worksheet isn't to be sent in, your own official W-2 forms have to be sent.
You must keep your official paper W-2 forms, from your employer(s) in your tax files for 7 years (or forever) just in case the IRS or state, want proof of the data that went in with your e-file
.