I'm going to call them and make sure it's them but yea I'm not going to be messing with the FAASomething is fishy. I don't see any issues with that video. Doesn't look like you were over 400ft and even if you were, how can they tell? And even if you were (not that I would condone that) they would want you to not do it again. They wouldn't be concerned with the video itself. Your site does look like you're trying to make money from flying drones. You need a 333 to do that. But be sure to verify their identity.
If it is the FAA, you should take it seriously. They likely won't do anything as long as you do as they ask. And if you want to make money with your drone, you need to go through the 333 exemption process.
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