<human>: Can you condense the text into a few key points?

So long story short - my phone was stolen from my college gym. Immediately when i got home I checked craigslist, and there was my phone; posted about ten minutes beforehand. I knew it was mine because of a very recognizable mark in the top corner. I contacted the guy, and pretended i was interested in buying it, but eventually asked the wrong question, and he knew it was me. He stopped texting me back and deleted the ad.  
I took a screenshot of the ad and the text messages, and took them to the authorities to fill out a police report. Its been a few days, and I suspect the police will do nothing, so i must take things into my own hands.  
I tried contacting him several times from several phones, to no avail. I even said I wouldnt involve the authorities if he gave it back. Nothing.  Ive done some research on the guy. Could not find anything on google or social media, except for some expired craigslist posts. Even did a reverse phone lookup. I think its incorrect.

[Screenshot of original ad](

Things i was able to find out about the guy:  
His phone number  
Zip Code  
ATT account number

What other steps might work in retrieving my phone?
<bot>: phone was stolen, thief posted to craigslist, i contacted him and now he wont return my messages. authorities wont do anything.