Pokémon booster boxes and Elite Trainer Boxes

Sealed means the box is still shut, exactly as it left the factory. A booster box holds 36 packs; an Elite Trainer Box holds nine packs plus sleeves, dice and a storage box. Some people open them, others put them away: unopened boxes of older sets get scarcer as more of them are cracked. Sealed always leaves here as an insured parcel, never through the letterbox.