Kalasin fined my wife for not reporting I was back home from Bangkok. They negotiated it down to 500 baht, no receipt. I guess they must have run out of them. As with any IO, be prepared for anything.
I'm off to Bangkok for a couple of days again soon, the day after my under consideration period is up. If my extension isn't ready when they say it should be, as it sometimes isn't, then that opens up an interesting question or two. Such as, it will seem to anyone who checks my passport, such as the hotel, that I'm on overstay. And technically I will be, as I only have permission to stay until the 29th (I'll be in Bangkok 30 and 31).