The first set of information was either delivered in person at US Nationals, but the invites that went out to premiere ranked players, came out via email with information to fill out and consents to be signed, those came a while ago, but the email said there is another information packet and I believe that is scheduling information and luggage tags etc. That should be coming via snail mail. If you are playing in the showdown and not TCG, you should make POP aware of that, because I believe if you rec'd the packet they are expecting you to play at TCG Worlds. You might want to check with them.
Well, if anyone else from the east coast gets this packet via snail mail, please post. Thanks!