The other way to do it would leave everything to mystery and let them do the opening while on the trip!
i.e.
Start with the suitcase and universal gifts. In the suitcase is the ticket print out BUT just the departure date. Fly to Orlando and go to Universal and enjoy the 2 days. The second night (or before you leave, if moving to WDW) bust out the magic bands/Disney gifts..... OMG! We're going to Disney Now????!!!!
Or while at Universal sometime later the second day, throw on some Mickey Ears and see if they catch on.
i.e.
Start with the suitcase and universal gifts. In the suitcase is the ticket print out BUT just the departure date. Fly to Orlando and go to Universal and enjoy the 2 days. The second night (or before you leave, if moving to WDW) bust out the magic bands/Disney gifts..... OMG! We're going to Disney Now????!!!!
Or while at Universal sometime later the second day, throw on some Mickey Ears and see if they catch on.