I agree any ball that is refusing is just going to get stressed out by you dangling food in his face. Give him at least a week and then try a live prey item that is appropriate for his size.
Stop all unnecessary handling. I hope you have a scale bc you should be recording any weighs, feedings, sheds, regurges, and defecations. This will give you a better background if he needs to go to The vet in the future.

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