If you entered every individual transaction for your investments trades/sales, meaning you did not summarize your transactions to reduce the number of entries, then you do not need to mail Form 8453 or any attachments.
If you did not enter each individual transaction and there were any summary totals entered then you must mail Form 8453 with the required attachments.
If the questions are answered correctly when entering the information, TurboTax will likely know if you need to mail the necessary forms. I hope this helps to clarify and provides the answer your question.
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