When there are many transactions it's possible to be prompted to mail your statement or other detail of transactions to the IRS. It's not clear why this may have happened in your experience.
You can still e-file your return and then mail the statement to the IRS within three days after your return is accepted (not before).
If you are e-filing your tax return, then mail your statements along with Form 8453 to:
Internal Revenue Service
Attn: Shipping and Receiving, 0254
Receipt and Control Branch
Austin, TX 73344-0254
If you need a blank Form 8453, you can download this pdf, enter your address information and check the box for Form 8949 (this form is really just a cover sheet).
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