Form 8453 is a cover sheet for your separte Form 8949 with detail.
You are describing a Form 8949 with summary.
There is no need to mail that form. you already filed it.
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If you are not excused by the detail reporting exception,
IRS requires details of your SELL transactions to be supplied on some Form 8949,
or on your other forms (e.g. consolidated 1099-B or spreadsheet) which have the same information and in the same manner as Form 8949.
@Hardway
