@splinterlands, in the announcement post, it seemed to indicate that the airdrops would only be for packs that had been purchased before then.

Please note that even if not all 2M packs are purchased during the second phase of the sale, the first two airdrops will still occur before the general sale begins and therefore will only be available to players who purchased packs before then.

I received one of the airdrop cards in a pack that I purchased. This seems to contradict the above. Is it possible to get airdrop cards from packs that were purchased before the airdrop, even if the pack itself is opened after?