How much is into these people for? Perhaps he should take this head on, contact the people and say he will repay them as soon as he is able. If these were offences that were not take into account at his trial, he will still be answerable for them and the court may not be as generous if they thought he had been cooperative on the cases he had been caught out for, but not the ones that nobody knew about. I don't know the answer, but it strikes me that doing nothing is not an option.