You do not need to mail anything if the transaction details are included in your tax return. The IRS requirement is that they receive the details of your sales transactions. If you entered a summary instead of entering each sale separately AND you entered manually computed adjustments, you would have received an instruction sheet telling you to mail Form 8453 within 3 days of e-filing.
When you save a copy of your tax return, you have the option to include some, all, or no supporting forms and worksheets. A full tax return that includes everything can be over 100 pages.
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