Certified Mail - Roommate signed

I just received the Green Card back from the Certified Mail I sent to my stbx. My stbx’s roommate signed for the mail. Is this OK?

Yes, so long as the roommate is of suitable age and discretion service is proper under Rule 4 of the NCRCP.

Yes, the roommate is 30. Will I be asked or need to show anything when bringing this back to the court house?

The green card, and an affidavit of service will be sufficient.