Feeding Box
I agree that the box is not necessary, but I certainly use one for our snakes. The benefits are as follows: the snake does not mistake your, our your children's, hands for food; substrate does not get accidentally swallowed; I personally have this thing with germs and stuff, so I'd rather put the prey in something I can sterilize before and after; you can be assured your not putting the prey on top of substrate that your snake recently used as the toilet; our snakes know when they go in the cage that it's dinner time and they eat very quickly. Most times, our snakes just get half their bodies in the cage before they start eating and never let go of our hands....
That is my opinion, anyway.