You will need to mail copies of your brokerage info along with a form 8453, Transmittal form to:
Internal Revenue Service
Attn: Shipping and Receiving, 0254
Receipt and Control Branch
Austin, TX 73344-0254
Here is a link with more information on the topic.
You can find a form 8453 here. You'll check the "8949" box near the bottom of this form.
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