The ways a set box is closed at the factory: tape seals, glued flaps or a perforated push-in tab.
Boxes are sealed in different ways depending on their size, age and region. Tape seals are small clear stickers across the flaps. Other boxes have glued flaps, or a perforated tab that is pushed in to open. Knowing which kind a set should have helps to recognise a resealed box.