Most KOA have a pick up box for late arrivals so you can get settled in and check in in the morning. I would recommend calling them to be safe.
This is standard for most rv parks. If you come after the office closes there is a map and info on where your spot is left outside the office somewhere. This KOA also had security buzzing around in a golfcart to help us out
Correct...ours was also taped to office door
They left my info taped the to front office door. Was pretty easy. That's for an RV Site though. Might be different if you're getting a cabin.
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