I found the damn thing on Friday by accident. There I was, doing a Venus patrol bounty. Cleared the "Vex sensor room" lobby and proceeded to get the chest inside. I get swarmed as I walk into the room only 5 seconds after clearing it. I ran outside after clearing them again to shoot some more. After about 5 spawns I grew bored. I did however get that Ether Sups bounty quickly!