a paper statement like he 751 cannot be e-filed with your return. this will require you to mail in your return with the 751 statement and the 8949 (or substitute statements - no 8453 filing). best way is registered mail or as a minimum proof of delivery/tracking. Just so you know the IRS got it.
8949 detail is required whenever there are transaction that are not reported on line 1a and/or 8a of schedule D. These are transaction where both the sales price and tax basis are properly reported to the IRS and there are no adjustments. if these lines are used the details for them do not have to be sent to the IRS. You still have the problem with the 751 since as stated it cannot be attached to an e-filed return
