Adjustment of Status - I-485

Hi Everyone!
So earlier I wrote here that I got an email saying that the notice was returned to uscis because the post office could not deliver it. About two hours after I got an udpate saying my documents were mailed. I live at the Grand Canyon and unfortunately we can't receive mails on our home address, only on our PO box. I called uscis about the change of address and informed them about how we cannot receive mails on our home address. I was thinking maybe that was the reason why the notices were returned to them because they might have sent it to my home address and not to my po box. I hope they send the documents to my po box this time! I have not received notice for biometrics appointment yet. Should I call the local office to schedule one or just wait til I get it? I'm giving it another week for all the notices to get here cuz I have only received one receipt which is the I 765. When I called uscis this morning and ask them if they can check what address they sent the documents, the officer told me that they are not able to check informations like that on their system. I just wanna make sure all the mails were being sent to my po box!!