Hearthstone Pack Opening Interuption

So I was opening a classic pack in Hearthstone.

1. I dragged the pack to the center of the screen to bust it open
2. I got invited to Brawl a friend
3. I accepted the invitation without clicking on any of the cards
4. After the Brawl I went back to click on my cards, but they were gone
5. When I checked my collection there were no new cards listed.

Obviously I could have just gotten duplicate cards, but it has me a little concerned. Did I get duplicates or did I just lose the pack :O

Solution 1:

The cards are opened as soon as you open the pack; you do not need to click on the cards to open them and 'send' them to your card collection.

Cards do not show as new if you have 2 or more of them, so it is likely you got 5 duplicates and they are hidden away in your deck somewhere.

http://us.battle.net/hearthstone/en/forum/topic/17086419786

Solution 2:

So I retested this last night.

1. I got my card counts to where I could see the increase even if I got a duplicate
2. Busted open a pack
3. Accepted an invitation from a friend before opening the pack
4. Went back to the pack opening screen after completing a game with my friend, the cards were again gone
5. Checked my collection

I did have 5 new cards; so I must have got 5 duplicates last time too.