私のベーコンクッキーを一箱全部食べちゃったのは誰!?— Can you read this sentence and understand what it means?

@EiriMatsu @aiju

This makes sense (as I agree ちゃった is more casual than てしまった), but actually, 私のベーコンクッキーを一箱全部食べちゃったのは誰ですか!? doesn’t sound awkward to me.

For example, I’d say ベーコンクッキーを一箱全部食べちゃったんです。in situations where I talk to someone who I don’t know well or boss, etc.

I would use 食べてしまったんです in written form but it could sound a bit stiff in conversations.

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