I'm sure you're aware of this, but just in case you aren't: If you can't get in touch with these people you can either get a clean room reimplementation of any pieces of code they contributed if they contributed a lot or if they contributed a small bit you could just revert their commits and reimplement the functionality another way. It is less than ideal, but a project I'm part of had to go the re-implement route recently as there were just too many contributors which could not be found.
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