There is no tracking number on mail sent by the IRS. The IRS will not make a direct deposit to a foreign bank account; they will only mail a check if you do not have a U.S. based bank account for a direct deposit.
LOST REFUND CHECK
https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/save-2021-turbo...
https://www.irs.gov/faqs/irs-procedures/refund-inquiries/refund-inquiries-0
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