If the Form 8453 didn't print, you can go to https://www.irs.gov/pub/irs-pdf/f8453.pdf and print the form. Fill out, check the box next to "Form 8949, Sales and Other Dispositions of Capital Assets (or a statement with the same information), if you elect not to report your transactions electronically on Form 8949" and then mail to IRS along with a copy of your Form 1099-B to the address in the instructions.
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