That is annoying and unfortunately because of that W2 you did have to mail it. There is no good news with tracking it other than if you owed money then the payment clearing will let you know that they got it and if you are owed money then the refund tracking tool will kick in at some point to let you know that they have the return.
Here's the refund tracking tool.
On the upside even if the return is rejected for some weird reason it will be registered as having been timely filed. So you are ok an that count.
@Erik271
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