Booking boni usually post split between the first and the last segment of an itinerary--it looks like you got a 2k bonus posted that way.

I'm not familiar with that promotion, so I can't tell you if that's correct or not...

...and, unfortunately, mileage boni and the like, are not normally itemized on your online statement, unlike other AAirlines (a printed quarterly statement that I seem to get does itemize them, though).