Don't worry about it. All non-Americans don't get magic bands mailed to them. So, all we do is have our resort reservation print out with the reservation number on it. They just look it up and we're good to go. As pp said, they just need some proof you have a reservation at a Disney resort.
If your DME luggage tags don't arrive you can either pick up you luggage yourself and they'll put it under control he bus for you our give them your luggage claim tag numbers and they will get it.