How local are you? Have you never driven down Riverside to the corner of Dickenson/Dickerson....whatever it's really called, at some point and time and seen activities with school children, busses, cars going in and out of the drive, etc.?

I know alot of schools in my area I've never stepped a foot into but is "obvious" that they are in operation without physically having to see the school from the common path.

How well did you know the teacher that supposedly taught up through 2011? A "friend" or an acquaintance, someone you talked to at the grocery store? And how well do you know the people that claimed to have kids at school that day?? This 6 degrees of separation is important to know. As suggested by someone maybe it's a cIA location or something like that. A community within a community. Really if you think about it, the driveway being so long and not being able to see the physical school from the main road....only people that needed to go up that drive from Riverside would know what was really there.....but there had to been activity going in and out someone regular through the day, especially in the morning when they're arriving and the afternoon when they're leaving.