Agreed with what the others have said about feeding in a separate container being unnecessary and often frowned upon by most experienced keepers because of the stress it causes them. Cage aggression is a myth. Same goes with people who will claim feeding live makes them aggressive. I feed thousands of live rats to our snakes in their tubs every year and I have ZERO food/cage aggressive snakes.
One thing I feel I must touch on since it seems to be a very common problem. What kind of fuzzies are you feeding your ball? I really hope they are rat fuzzies because mouse fuzzies are far too small of a meal for a 160g ball. I will advise you, as well as most of the breeders/long term keepers, to get a small digital scale and feed your snake 10-15% of its body weight every week. Rats are preferred because they are slightly more nutritious and its easier to feed one appropriate sized rat vs multiple mice as your snake grows. As your snake becomes an adult you can cut back on the food a little since their metabolisms slow down (the exception would be for breeding, etc which I wouldn't worry about all that yet).
AKedit: It IS safe to leave live rat FUZZIES in your snakes container unsupervised. Anything larger than that is not because they can scratch and bite back. If you feed live, just use common sense. It's real simple and there are lots of threads on that subject if you use the search feature.