Okay. So it'll be a little more difficult than simply asking.

"Why are they yours?"

He also isn't arguing, simply asking a question. He wants to know the path of logic that led them here, if there is one at all. Maybe he'll decide it isn't worth the pain of teaching a pile of ghosts about things like the possession of material goods. This would sure explain why he caught him being accused of stealing from a market stall in the first place...