If it were me, first thing I would do would be to call HR and ask which they want. With all the transition around here, seems like its easy for stuff like that to fall through the cracks. If you can't get a straight answer from them on that, cover your butt and do both. Make very good quality photocopies and send those in and bring the originals to the interview with you or vice-versa. I don't want to scare you but there are few things will end an interview quicker than a paperwork problem.