I feed all my snakes in their cages, I used to have some of the giant pythons and can definitely attest to the fact that they stay in food mode for a LONG time after they eat. And both of my boas do as well, they tend to track anything that moves for quite some time after they've eaten. The only other boid I have is my anaconda and she is the same way, so my suggestion would be to feed in the cage. I "train" my snakes with patterns to recognize when it's time to feed and time to lay. For instance when I had my tiger retic I would tap on the glass three times when it was cleaning or play time and I wouldn't do it when it was time to feed. He learned very quickly what it meant when I opened his cage. The boas seem to be just as smart so I'm sure they'll figure it out as well. Just my two cents.