If he wears a collar, try attaching three bells on it. One under his chin and the other two on the side of his neck.

If you just place one bell on the collar, the cat learns how to move, so the bell doesn't ring !!!

But as others had mentioned, these things are gifts and should be received in love (and thrown in the bin asap)

I remember my childhood indoor/outside RB cat Lindy. Sitting on our dustbin, after my mother had thrown 'her presents' away. Her expression said ' Well, if YOU didn't want them, I would have eaten them'

PS. The RSPCA doesn't recommand collars, perfering cats to be microchipped instead but if he has one it should be elasticated to prevent injuries to the cat.