I had the same experience. No indication they were unhappy and the queue to get through immigration was seperate and much shorter than the other queues
I did my 90 day in person yesterday and I wasn't deported. I left the "ARRIVAL CARD NO." question blank and nothing was said at all. Just like Thai Airways, "Smooth as Silk". :)
That's what I thought, just wondered if anybody else has done that yet. Anyway, I'll be going in tomorrow morning, so I guess I'll find out. I'll update here tomorrow afternoon (provided I havent been deported by then. 🙂 )
Most Thai traffic police can't read or write English, and if you show them a license when asked, they will just assume it has a MC endorsement, or just think it's not worth the trouble anyway.