Thanks for posting this, I'll do mine later this month. Is there a specific time for dropping off all the paperwork? What's the latest for that? Thanks.
I've done 4 trips to Cambodia to get the extra 90 days, I enter at the one you did, and exit a Chong Chom the next day, and I've never had to pay anything to leave. On all my trips I've ridden my bicycle which seems to give me a special status with Immigration Officers.