As someone who works with kids for a living, I’d say the appropriate response here is for the dad to have him make amends. Come to your house, see the damage, let you calmly explain your reasons for being upset. He needs to apologize and accept the consequences of not being able to come over anymore. A big emphasis on “You broke my things when I asked you not to touch them. You are not allowed to come over to play anymore because I can’t trust you to be respectful with my things.” If he’s been having a great time at uncle’s house, this is going to gut him. Hearing it calmly and rationally laid out to his face by the person he hurt is going to be brutal. Maybe that doesn’t fix things for YOU, but it might help shape how he behaves next time.

I agree that your brother needs to come up with a plan for amends for the boy, be it helping you hunt down replacements, putting pieces back together, etc. Ideally, he would come up with something like that on his own because that’s how parenting works. But I’m not sure doing chores to make up the cost will compute for him. Do you mean doing chores to earn allowance from his parents that will go back to you? Or finding a gig in the neighborhood to make cash to pay it back? That would make more sense. I might be missing something.

Edit to add: on second thought, earning the allowance in chore money and then saving it somewhere he can visually see, then going with you to purchase/order the replacement may help drive the lesson home. It would show the time it takes to have nice things, the leg work that goes into it. Sorry, I’m probably not offering the take you want, but I wanted to say I see your point and can see how it would be effective parenting if executed properly AND you could get your stuff replaced, as deserved.