A friend of mine made a portal in my residence one night to summon JustinGuy: http://empireminecraft.com/threads/justinguy-and-the-mysterious-portal.16961/#post-299614 Never did get it to work. Maybe it needs a beacon.
People don't generally post threads about Easter Eggs... Ruins the surprise and opportunity for people to stumble across it themselves... Just saying
There probably used to be one, but it disappeared somehow and he now roams EMC. The slabs could have been the way they were keeping the coffin closed .
He has a family to look after and he has a job That's why we don't see him online much, but Justin probably doesn't play because it's hard to when you're an admin. Justin might have played before though, designing spawns, shops, ect. on EMC with GKJ/IcecreamCow He does do a lot of our updating and code maintanence, behind the scenes with Aikar who might take over Justin's position eventually