Does TT have a record of what dates you logged into the system for whatever reason? I can't remember when I completed an amended return and printed it.

[xmasbaby0]

You can look to see when you logged in to your account.  The date you logged in to amend and printed might not be the same date that you took your amended return to a mailbox.  Only you would know when you did that.

Turbotax has a new feature that tracks the dates, times, and approximate locations your account was accessed.  You can log in and check this feature.  Make sure you log in by typing the address in your web browser and check for the padlock icon that means you have a verified connection.  Click Account Tools, then Security, then scroll down for access history.

• Be aware that the date and time will be accurate, but the location may be less accurate, especially if you are using a cell phone. Determining location from an internet address is notoriously prone to error.   But, any overseas access is definitely a problem.  If there are log ins you don't recognize, you can call customer support, and also take steps (below) to secure your account better. 
• To secure your account, log in to your Turbotax account by typing the address into your browser window, and make sure your browser shows a padlock icon or whatever symbol it uses to indicate a secure verified connection.  Change your password, and make sure it is not something you use on other web sites.  Change your security question to something that a crook could not guess from social media.  Make sure your email address and cell phone number are up to date as Turbotax may use that to help verify future attempts to log in.
• You also have the option to turn on 2-factor authentication for all log-ins.  With 2-factor authentication, Turbotax will send a code to your email or cell phone when you try to log in. The idea is that only someone who knows your password and also has possession of your phone will be able to log in, this is more likely to be the real you.  Turbotax will use 2-factor authentication whenever you log in from a computer that turbotax does not recognize, but you can turn it on for all log-ins in your security settings.
• Also see these two FAQ's about the emails being sent to alert users on the new security measures:
  https://ttlc.intuit.com/questions/2922944-i-received-an-email-about-using-different-turbotax-account...
  and
  https://ttlc.intuit.com/questions/2934086-i-received-an-email-about-using-a-new-device

   The IRS has not been working on mailed returns until very recently---and an amended return can only be filed by mailing it in. Last week they finally began to accept e-filed  amended 2019 returns.    Under normal circumstances you would be able to see something about your mailed in Form 1040X after about three weeks, but that is not the case right now.  The usual 4 months for processing an amended return is going to take longer.  Sorry.

https://www.cnn.com/2020/04/20/politics/irs-mail-trailers-covid/index.html

MAILED RETURNS

Per the IRS website IRS Operations During COVID-19: Mission-critical functions continue:  

IRS operational status and alternatives

Processing Delays for Paper Tax Returns: Taxpayers should file electronically through their tax preparer, tax software provider, or IRS Free File. 

We’re experiencing delays in processing paper tax returns due to limited staffing. If you already filed a paper return, we will process it in the order we received it.

Do not file a second tax return or contact the IRS about the status of your return.

 If you mail a tax return (or a payment) to the IRS, it is a good idea to use a mailing service that will track it like UPS or certified mail so you will know it was received.

 TurboTax will not know anything about your amended return, and nor will TT know that you put your 1040X  in an envelope and took it to a mailbox.  TurboTax does not get updates on mailed  (or e-filed) returns.

When the IRS finally opens its mail and begins to process mailed returns you can check the status on the IRS site.

https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1

https://www.irs.gov/filing/individuals/amended-returns-form-1040-x/amended-return-frequently-asked-q...