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I got a reply from Employee Tax Expert that the address I put in my message was correct and also matched the address on the form.    The Post Office ( when I track it using the tracking number ) only states that they have the envelope and the associated return receipt and that it is in the US Postal Service network?     I may actually go to the Post office today to inquire.  I also may try to contact other tax preparers, CPAs to see if they know anything.  This is very frustrating and concerning.  Also, if it should be returned to the sender the sender has to sign for it since it was sent return receipt requested.