It used to be you could see what cards were in a Magic the Gathering booster without opening it by pushing each card one at a time to the edge of the pack and s

It used to be you could see what cards were in a Magic the Gathering booster without opening it by pushing each card one at a time to the edge of the pack and shining a bright light behind it. The edge of the packaging was white, so the name of the card would shine through. I think most people into collectible card games know boosters aren't to be trusted in general.