The general rule is that USCIS will not deliver to P.O.Boxes. Proceed at your own risk. Best practice will be to pay some more money and get a real street address with a "suite" number or a "number", period.
Behar Intl. Counsel 619.234.5962 Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
Hopefully you had a lawyer help and he/she can use his/her address for you.
Hopefully you, or your lawyer, filed a G-1145 ... with the receipt number you received by e-mail you can call CIS.
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I agree. USCIS generally will not deliver to PO Box addresses. Use an attorney address, or a different address of someone you trust. But yes, you can file a change of address.
Just be careful because we have seen a lot of mail related issues and it's usually because Post Office and USCIS are very strict and particular about delivery of mail. If there's even a small issue, it will not be delivered.
Dhenu Savla, Esq.
This answer does not create an attorney-client relationship and is not meant to be relied upon as legal advice.
I agree with the other attorneys that P.O boxes are a bad idea. I would also add that if you are going to do a change of address, consider using the online change of address option on www.uscis.gov website. It allows you to do a general change of address and then do one for each form you have pending using the receipt numbers (like I-485, I-765, I-131 etc....) and more importantly gives you a confirmation number of each change of address you have done.