An alternative is to file an extension immediately, then ask for a transcript of your account at the IRS. You'll want the Wage and Income Transcript, which you may be able to get online. Your employer should have sent a copy of your W-2 to the IRS (just like your employer was supposed to send you a copy by January 31st, as Don said).
This is a lot of work and may or may not work, so do what Don suggested, but use the Transcript as fallback.
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