You can try to get a transcript of the W-2 from the IRS online.
Go to this IRS webpage Get Transcript. You want to get the Wage and Income Transcript. This is a listing of the lines and numbers on many of the forms that the IRS receives (the W-2 should have been copied to the IRS at the same time it should have been mailed to your spouse).
Be prepared to prove who (your spouse) are, by answering questions from your spouse's credit report. With luck, you will be able to get the transcript online.
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