After you file

If your transcripts show that refunds were paid and you never received them, you can run a trace here <a rel="nofollow" target="_blank" href="https://www.irs.gov/help-resources/tools-faqs/faqs-for-individuals/frequently-asked-tax-questions-an...>

Did you use refund transfer to deduct Turbotax fees from your federal refund?  If so, and if the refund was not paid by the IRS, Turbotax would have billed you separately.  If that never happened, your refund may have gone to the 3rd party processor.  If they can't verify your bank information, they send the money back to the IRS after 4 weeks and the IRS sends you a letter.

It seems odd that you have no correspondence from anyone and just noticed this now?