[PurpleKat]

I've tried giving boxes with food and it keeps her busy, I stopped putting holes as it gives her a start, she chews and makes her way into the box.

I've even started placing her food wrapped in paper, then placed in egg boxes which does keep her busy and she enjoys for about 3 hours. We have 12 egg boxes so it's how I feed her normal food.

Also wrapped in paper her food which is placed in a wooden chew tunnel with holes.

Willow balls last about a week, she rolls to get the food out then chews hard.
I also give her whole shelled peanuts and walnuts.