Someone sent 2.5k worth of ETH by mistake

A friend (genuinely) received about 2.5k worth of Ethereum to their phantom wallet. They've no idea where it came from. They've already successfully converted it to cash. There's surely no one out there sending 2.5k for dusting/address-poisoning scams. So far, no one has made contact looking to engineer a "refund" (thought not sure how they would). What's the scam here, or is it most likely a mistake and someone just sent to the wrong address (in which case they should send it back, bu

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