When a pack contains a booster box rather than a single card.
Some pack pools contain sealed products — factory-sealed booster boxes, Elite Trainer Boxes and similar — instead of single cards.
Spotting them
Sealed products are marked distinctly in the pool and at reveal. They show a
product type and, where relevant, how many packs are inside.
They behave like cards
A sealed product sits in your Vault the same way a card does. You can ship it, sell it back, or list it.
Shipping is different
Sealed products are bulky. A booster box is far larger and heavier than a card,
so shipping costs more than a card shipment. The quote you're given at request time reflects the real parcel.
Opening one
If you ship a sealed product to yourself, what's inside is yours to open — but
that happens at home, off HOLO. Cards from a box you opened yourself aren't tracked in your HOLO Vault and can't be listed on the Marketplace.
Selling it sealed generally realises more than opening it. Sealed product tends
to appreciate; opened boxes usually don't.