I bought an IPhone off craigslist?

I know very stupid. Well anyways me thinking someone just sold it because they bought the iphone 5 or something decided to take it to the sprint store and just activate it well she told me that she can't do anything because its reported lost or stolen. I told the guy who sold it to me and he said he can't help me and is playing dumb saying he didn't know and making all these excuses. Anyways I don't want this phone if its lost or stolen and I want to take it to the police station and just report it but I don't want to be blamed for this.

Was it by chance the Portland craigslist?