This is a common action and not unusual. If summary totals are used it is a requirement by the IRS. It's not clear if you selected to use summary totals.
If you did not summarize your totals, the mailing of these statements with Form 8453 should eliminate any questions in the future. The Form 8949 was e-filed with your return and the detail statement is your backup which should be attached with the mailing. The IRS already has the same copy of your Form 1099-B that you received.
TurboTax supplied the address and it is listed here for your convenience. Place them in the mail within three days of the IRS accepting your tax return.
Internal Revenue Service
Attn: Shipping and Receiving, 0254
Receipt and Control Branch
Austin, TX 73344-0254
@masterpan
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