Where can I find documented proof of acceptance of my fed and state returns for 24?

You should see the e-file status on the Tax Home Screen of your account. You should have also received an email from TurboTax with the acceptance status. 

How do I check my e-file status?

Did you e-file?  Did you click a big orange button that said “Transmit my returns now?”

When you e-file your federal return you will receive two emails from TurboTax.  The first one will say that your return was submitted.  The second email will tell you if your federal return was accepted or rejected.  If you e-filed a state return, there will be a third email to tell you if the state accepted or rejected your state return.

First, check your e-file status to see if your return was accepted: 

https://turbotax.intuit.com/tax-tools/efile-status-lookup/

If the IRS accepted it, what does it say here?  

https://www.irs.gov/refunds         

  Or does your account say “Ready to Mail?” Or “Rejected?” Or “Printed?”

Note:  If it says “Rejected,” “Ready to Mail” or “Printed” that means YOU have to mail it yourself.  TurboTax does not mail your tax return for you.

If you realize now that your return was not e-filed successfully, then you will need to file it by mail.  E-filing is permanently closed for past year returns.  You will need to print the return, sign and date it in ink, and mail it in.