Hey,

If winner does not receive exactly what they were promised - they will need to mark giveaway as not received.

Good practice before you confirm the giveaway is to check thumbnail of the game you are giving away - it needs to be the same as the thumbnail of the game from bundle or shop.

You can check appID or subID of the game or DLC to confirm it as well. They are visible under the name of the game on /create-giveaway page, and most of the time shops have direct link to Steam Store page of the game you want to give away.