Honestly, i would be utterly horrified if my child broke someone elses property and would immediately offer to fix/replace if possible.

We have had items of ours broken by other peoples children, some were replaced and others i didnt get an apology. One of the toys my DD got for her birthday was broken on her actual birthday by other children. I didn't know until hours after they all left. I don't know whose child it was but i don't think the parents would have known either so i let it go.

I had a friend come over the other week and her son destroyed my DDs room and she didn't say anything, he scratched/dented the walls and no apology. I wasn't happy about that.