Usually, the file has a name like "John Smith 2023.tax2023". By default, it is saved in your Documents folder unless you choose another location. Try searching for the filename extension ".tax" or ".tax2023".
No one has a backup copy of your tax file except you.
You can get a transcript of your tax return, showing what you filed, by using or creating your personal account at the IRS.
https://www.irs.gov/individuals/get-transcript
I'm not sure that will help, since you know the refund amount you expect, and the IRS claim to have paid it.
If you used refund transfer, to have turbotax fees deducted from your refund, or to get your refund on a debit card, you can call SBT bank. If they could not verify your information, they are supposed to send your refund back to the IRS, who mails you a check.
https://www.sbtpg.com/
Have you moved recently? Is the address on your return the same place where you would want to get a check mailed if there was a problem with direct deposit?
You can start to trace your refund here.
https://www.irs.gov/faqs/irs-procedures/refund-inquiries/refund-inquiries-0
Did you do direct deposit into your own account, or someone else's? If you accidentally or on purpose, gave an incorrect bank account number for direct deposit, the bank should have rejected the deposit, at which point the IRS will mail a check. But if the bank accepted the deposit even though it was not your account, then you have to talk to the bank. The IRS won't help you if they deposited the refund into the bank account that you told them to.
