By mentioning that some DLC 1 & DLC 2 cards are locked, Siffow was indicating that players are/were not able to obtain these cards until the unlock conditions are paired to things currently available to players in The Taken King. Until the programming trigger events are properly rewritten to accommodate this, players should expect these cards to not be available to unlock. This would take some time and would likely involve a patch to the game client. As such, I would suggest leaving a character with all of the "Abandoned Quests" involved with The Dark Below and House of Wolves as yet to be done, at least until you see a change reflected in Siffow's post and/or the patch notes in future patches. Currently, the only mechanism for unlocking the other related legacy cards is tagged to completion of the aforementioned quest chains. It is reasonable to assume that the bugged cards will have a similar unlock condition once the errors are corrected. With regard to the Eyes, Hand, and Heart of Crota, these enemies appear in Patrol Cosmodrome. Eyes are available in the area between Skywatch and Forgotten Shores (kill the praying hive enemy and interact with the urn it was praying to in order to summon the eyes). Hand is available between Mothyards and Skywatch in the room with the hive knight, several hive acolytes, and a sidelined servant of the hand thrall (clear out the knight and acolytes first, then kill the servant to summon the hand). Heart is available in Refinery (between Rocketyards and Grottos) in the room before the Hive/Fallen battle room (kill the acolyte that is inset to your left as you enter from Rocketyards side in order to summon the heart). I do not know if killing them will unlock the cards for you, but it is worth a shot and they always are available through patrol.