It all depends if the person wants to be found or not. Did he make absolutely no hints as to the fact that he was leaving, and all that?
I've suffered from some bi-polar effects before and I know in some cases (much milder, I never actually left town) I wanted to be left alone to sort things out in my mind, while other times I would withdraw but would deep down, want to be found so someone could help me through it.
Given the family's reaction, maybe he does't want to be found? Yet they know where he is, so maybe he does?
Sorry for not being a help, I think though to narrow it down that's the question you need to try and figure out.
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