I don't have a set feeding schedule set up yet and I don't know the old owner's feeding schedule. So, here's something interesting. The tank I keep Morana in has a sliding top with a small hole in the lip and tank for a pin to lock. Since the tank is a bit higher than I am tall, I usually have to fumble around to get the pin out. Usually, this causes Morana to poke her head out of her hide. If she sees the lid coming off, she comes out and starts cruising around since it means one of two things: either it's dinner time, or she's going to get handled.
Another thing that's interesting is that the first time I handled her after I got her, I took the hide out since she was under it. I put her in first, then the hide. She did the tail buzzing until I put it down. After investigating it, she hasn't done the tail buzzing since and I do the same routine. I think snakes do have a sort of intelligence, despite some of it being conditioning or getting used to routine.