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@chasetax " If they owe, enclosing a check (and having it clear) shows IRS has received the package."
But it only shows that there was a check in the package. Or maybe the check was in another envelope, and the package was empty. But I doubt that the anxiety over the mailing address is due to owing taxes -- there's no doubt a refund involved.
IRS Service Centers have their own ZIP Code, but sometimes the 4-digit extension helps get the mail sorted. The Post Office delivers to the physical IRS paperwork factory. I wouldn't stand in line on the day before April 15-in-July, even wearing a mask, to mail something certified. But I have enough outgoing mail, for various reasons, that I pay a monthly fee for stamps.com and get a tracking number and delivery confirmation on large envelopes and packages.