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In NY Small Claims court you can only sue for up to $5000 and that would be the most you could ever get once you get a judgment against them on this matter. If you pursue the buyer in the Supreme Court, even if you cannot get money because he owns nothing, you could get the court to give you the route back so you could seek to resell it if the route still has any value. If the route has no value any longer and he has no property you could collect from, then you can go to small claims if you decide you would be happy just trying to get only $5000 and nothing more. I say "trying" because even if you win $5000 in small claims, you would still have to collect it from him and if he has no money or property, you would still be faced with no way to collect.
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