Yes, you are required to send in additional information, if you did a summary in lieu of individual transactions. This means you can E-file but you have three days, from the date the IRS accepted your return, to yes, mail in the your 1099-B forms that you received from your financial institution.
There's no cover letter. Just print and mail Form 8453. Mail Form 8453, with your attachments to:
Internal Revenue Service
Attn: Shipping and Receiving, 0254
Receipt and Control Branch
Austin, TX 73344-0254
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