My boss hasn't paid me, what should I do?

so I was doing construction off the books for over two weeks and He said he'll pay me once the check comes in after finishing the project, so after the two weeks he stopped calling me to come in so i called him & was like wheres my money & whatever and yesterday he said he'll have it for me tomorrow ( which was today so i called him & he said he's gonna be working late & he'll drop it off tonight & he never did. I kept trying to call him from several different phones & he hasn't been answering. But on face book he's made five status within the last 4 hours. I didn't sign any papers saying i was working for him & whatever & he owes me about 1300$. what should i do? I'm at a complete lost & i know i cant do anything with the police cause he can just deny me working for him. I'm stuck =[