Well I'm not trying to lie, two things could have happened. (To bad I infused that one) 1. I might have confused secret round perk for it. (Looks the same) 2. I was extremely lucky and it did drop for me. I can still recall naming it out to my friends and they were like okey nice. But the other perks were crap. So I have no proof since I infused all but the one I liked most...