[Should I be worried?[/QUOTE]
Don't Worry! Be Happy!
Had exactly the same situation on my most recent page addition about a year ago. No seal and the words "under seal" were crossed out. No problems in either entering the US or other countries.
A previous page addition about two years ago did have the seal, however. Seems like the requirement for the seal has been dropped.
Thanks for the tip in the thread to ask for two sets of extra pages at once. Never thought of this before. Saves a lot of time and trouble
Rens