The BTC has already been through a mixer (as was noted by the mixer service in Klee's topic) and supposedly all records that could have traced the mixing have already been deleted (so there is no way that they can trace the hacker without at least losing their credibility as a mixing service).

I do think that the stuff about having 36 days to return the 462 BTC amount doesn't look very legit (i.e. the hacker gains 1 month to "disappear to another country").