My wife as a student once came home with two phones in her bag. To be fair to her, they both LOOKED a lot like her phone ... ...
Had been to multiple places so no idea where it even came from, intended to hand it in somewhere but I believe it was found kicking about in a drawer at the end of the year
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No chance of there being a tracker on it as this was in ye olde times of flip-phones and Snake... no Bluetooth or GPS.