The employer did a great job handling the excess so you don't need the form 8443. You just need to amend for the repayment. Well done!
If you miss the deadline, you don't get a refund if you file more than 3 years after the original deadline. That return was originally due April 18, 2023.
The post office marking is the proof of mailing it on time. Send it with tracking, no signature required and keep your proof of mailing on time.
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