@CGK3
Your bank does not have a clue how e-filed tax returns using tax preparation software is used. Since e-filing has been around for about 30 years there should be no reason for them to ask you about signatures on the Form 1040.
The Electronic Postmark Report provided by TurboTax is your proof of e-filing. There is not a Form 8879 since you used do-it-yourself tax preparation software where e-filing the return is included in the software. Your tax return was self-prepared and e-filed without the need of an ERO (Electronic Return Originator)
