I very much doubt if anyone will be caught because I don't think that the FBI will even bother to look. Realistically, if a computer is owned and used for this sort of thing for an extended period of time (as this was) there is unlikely to be much in the way of evidence as security is nonexistent.

I would imagine that the information is only really of value within the USA? and that the FBI will be waiting for someone to try to use it fraudulently.

It is much easier to follow the money