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I'd just ask around. When I get there next week, I'll use my Thai DL as it can be used in Cambodia, and if that doesn't work, I'll use the International DE I just got issued. I even have my US DL to show them although it's long expired. It's better to cover all bases if you can. But if you explain your situation and maybe are willing to pay some under the table money maybe that will help. You have a car/truck with registration and all the proper documents, right? That should help you in proving your case. Hey, shit happens. They should be willing to work with you.