Wait to see if the IRS requests them from you.
Typically, they'll ask for missing W-2s and 1099-Rs if the combined withholding amounts on those forms is over a certain dollar amount, and you're receiving a refund of a certain dollar amount.
Sending in documents after you've filed your return runs the chance of documents criss-crossing in the mail, and causing confusion for both you and the IRS.
If they don't ask, don't worry about it.
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