You could always go down to the courthouse and speak to a clerk OP. I'd see what methods of payment they accept and bring one in case you can take care of it. If he has to make an appearance (sounds like the officer made a mistake) just ask to have it rescheduled.

Was the OT with a sensory integration OT? That's an eval that I think will give you a lot of answers. It's not just sensitivity to certain input, it's the processing, speed of processing, etc, that I think it getting in his way with play. Where are you? In DC Leaps & Bounds and Lynne Israel are good for treatment, Lynn Balzer Martin just does evals but is excellent. In MD I've heard great things about ITS for Children and Families. Best of luck, the more you do now, the better his self esteem will be. Social skills are more than greeting, it's attention to social cues, and back and forth shared interaction. He is still ok for parallel play but they are seeing something that concerns them so check out what could be fueling the difference. Good luck to you and the little guy!