Yes that is what I am buying. It is 6,000 total for the 5 mystery gifts.

Sometimes your gift will be a pack of cards, sometimes just 1 card, sometimes it will be gold foil or legendary charges.

I think your 2 reward cards showing was likely from your quest yesterday, that has been happening to me as well the past few days when i log in, but you are not getting 2 more cards there because you already got them, im sure they will fix that unneeded visual soon.