Thankfully,
it'll show on the box if it's a Game-Key Card.
I understand the sentiment, but the reason digital games are licensed, not sold, is because there needs to be restrictions on what you can do with it. As in, you own a license to play the game whenever you wish, but you don't own the right to do whatever you want with the 1s and 0s of the game, like redistributing it or selling copies of it yourself. The same goes for physical games; you own the disc or the card, but you don't own its contents and are not free to do anything you want with its contents. Even physical books carry an implicit "license," since you're not allowed to make and sell copies of them after buying them.
Now, physical games of course grant the extra freedom of being able to sell or give away that specific copy, so in that sense the "ownership" is greater.