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Since it is not known what the police questioned the driver about, there is no way of really knowing why they need to keep the car for X number of days. Since they also charge for storage (which I think is a total ripoff), it would be a good idea to retain a lawyer because they can cut through all of the red tape and the police cannot BS the attorney.
Regarding your question about International Driver's Licenses - If a person is a resident of any State in the United States, he or she cannot use an international driver's license here. They must use the driver's license of the State of their residence. The International driver's license can only be used by them outside the United States.
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