@ Bluebird- once they have their dorm assignments and addresses, you Can start getting ready to ship- but when you get the info- it will give you specific instructions on when The science center will begin receiving mail for that address.
The students have a meeting at the end of move in day- and their time after that is very tightly scheduled with "get to know Harvard" and "Here is how life is going to be here" meetings. So it's like that first day at daycare/preschool when they pull out of your hand with a "Love you M" as they run for their new friends and toys.
Good Luck!