This happened to one of my friends. She mailed some BoAs to a new character on a new server, and they just vanished. Didn't appear in the new character's mail, or back on the character she sent them from. She's had a ticket open for a few days now and today it was closed with no response. She's not too happy with that.
Also, she got no special code or response of any kind. The ticket just closed with a survey popping up.