edit and make this email formal

I want to email this message For USCIS U.S immigration. I want you to make it formal

I want to ask USCIS about Mailing Address for Green Card. I put In DS260 form that I said I want my Green Card to be mailed to a P O Box instead of a residential address, which is under my son’s name. Also, the Immigrant Data Summary paper that was taken in the Airport immigration service shows the final address in the U. S is the P O Box. Does USCIS mail Green card into P O Box. Furthermore, it has been more than two-month sines I paid the fee. I paid the fee before I entered the United States. What should I do? Thank you