Oh, it was a bundle from months ago. I have a large list and I just randomly pick games from it every week, preferably of those bundles that were finished long ago. (So people like you, who missed it, can get them.)
But to answer the question itself, it was from Every Monday Bundle #61, finished in early June. ANd these are my last keys, so I cannot even trade with you. But there are 36 people who still have keys, if you have some leftover bundle keys of your own.