Ok, my brother has a 2019 MacBook Pro i7 Processor that he's giving to a friend. It has been dead for weeks. He has a new charger coming in mail this week. Laptop hasn't been powered on in weeks.Yesterday he Removed the laptop from his devices on the Find My iPhone app and also using icloud.com. but when using an online Serial number checker it says Find my iphone is still on. Is it because the laptop has not been powered on ???