I am now into May, and I have to say that while I naturally went back and checked all of Sirius's posts regarding tracking down Justin, I had forgotten that his existence was tipped off by a disturbance big enough to require the French Ministry cleanup crew....

Justin being a virtual shut-in, btw, was inspired by Colin from The Secret Garden. That's also why he starts off as a bit peevish and spoiled and immediately gets way better once he's no longer kept prisoner in his own house!