Found an iPhone what shouldbi do? Its a tricky situation?

Found an iphone 4 on a bus today and thought of finding the person to return it but no luck so far. My sister had hers stolen last month from london and she cried for dayss and she wants it I don't know what to do, the owner hasn't tried to contact or anything and I feel bad but then maybe its meant to be for my sister?! The owner has an email account so I could try to locate him/her but not sure atm. Someone give some honest advice please thanks.

Return it.

Try to know if its someone's if you don't sell it or keep it

but man don't just keep it

Just be a good person and take it to the police station

Take it to the Police Station.
The Owner can be traced from the IMEI.
Don't be a thief.
If it is reported stolen, it will stop working very shortly, or it may have the Find my phone app installed, what will be your excuse when the police come calling?

Could be a set phone to Catch people… Similar to 'bait car' … So be careful, i'd return it if you could

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