system
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All that’s true assuming you’re dealing with professional thieves. Though, most thefts are done by opportunists that see a chance to steal an unguarded device and take it. Often these are not the smartest of people… with low-income/in heavy debt.
I’m afraid your best chances are with the police. However, an IP alone might not be enough to pinpoint one specific person/address. This might make it difficult for them to get a warrant.