Got scammed on Craigslist?

Got acouple of questions for some of you. Acouple months ago i noticed a item on craigslist. So i contacted the phone number in the listing and talked to the guy for acouple of minutes, and told him i would take the item($600). So i sent him a postal money order overnight(i live in NY and he lives in FL). So come saturday the post office tried to deliever the money order but he was not there. So come sunday morning on one of my forums that i write one i noticed that someone made a post about buying a certain item. It is the same item that i sent the money order two days before(were talking a one of the kind items, guy also lived only a hour from him). So all days Sunday i tried calling the seller about what is happening. He never picks up the phone till i call from another phone, in are brief conversation he said he will not sign for the letter and that the post office will ship it back to me. But come monday morning i looked at the tracking number and seen he picked it up. After that i tried to call him again and no answer. Later that night he called my sisters cell phone(other phone i used on sunday), and he told her to tell me that he was mailing the item out. This is after he said he is sending my money back and i also no that he already sold the item. Well as of today im left with nothing. The sad thing is i called the Daytona police and they told me to send my copys of my proof for them. Well they have never wrote or called me back. So is there anything else i can do to try to get my money back from this scammer.