Is there still supposed to be like an envelope to go in the envelope for invitations? My Mom mentioned it and and all the "how to address them" articles they mention the outside envelope and then the inside envelope, but I just got mine delivered and there's only the main one and then the one that the rsvp's come back to us in. Am I missing something? Do people not do this anymore or do I need to order them again/separate? I used vistaprint.