Good question. I wonder if a captive snake is accustomed to knowing it'll be fed with some regularity, whereas a wild one is less certain if / when it'll find its next meal.
They definitely get accustomed, she is quite predictable in her time table and eating habits. It took a good couple months before she finally ate her first mouse. The brown tree snake in Guam appears to be quite the survivor and doesn't appear to be as picky. Still, from the little I do understand about snakes, the temperature of the food seems to play a major factor for them. That's where I'm most concerned about this plan failing.