If you have no home address, you will need to use your PO box since that appears to be the only way to send mail to you. If you do not have a home address for them to send it and you use your old address, whoever is living there now would get your mail from the IRS.
You can either use your PO box or your foreign address, whichever one you will receive mail to. Do not add additional information on a location you do not live.
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