I noticed with my Lurker at the threshold expansion, the cards have a symbol on the cards to differentiate them. But my KIY has no marks, why is this? Seems like it will be a pain to separate the cards... Or am I just missing some subtle marker?

There is a marker. A little yellow sign. The only thing is that is placed in a position different from the "normal" position: it's immediately under the image of any object, in the lower right corner

Wow ok! Thanks a lot, I was wondering what was up!