Take a look at your Form 1099-B and see if there is anything reported in box 4 for Federal taxes withheld. If that box is empty or zero, then you do not need to send it to the IRS to satisfy the request of any documents showing tax withholdings.
The Form SSA-1099 should be all that you need to send since you stated earlier that the amount of taxes withheld and shown on that form is the exact amount of refund that you are expecting from filing your return.
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