User blog comment:FromDvToZombies/Zetsubou no Shima pre-release interview revealing a few details about Jason Blundell's thought proccess with DLC 3 and DLC 4's Zombies map./@comment-1187559-20160516165012/@comment-1916935-20160516165624

Yeah, I'd agree. Either they're straight up lying to us, or the easter eggs are for something really vague or unknown that a dev just happened to like. I mean people have been pouring over every square inch of every map since a story began to appear. If there's anything left to find, it would've been found by now.