Resourcefulness

While riding my bike around the neighborhood, I discovered a large house being build with a even larger dumpster in front of it. I looked through the dumpster hoping to find something that I could paint on. Laying on the very top was about $300 worth of plaster board. I felt kind of weird taking it home in the middle of the day. I could just imagine the police asking me why I was walking home with a load of wood under my arm. To avoid being questioned I went back after night fall, like a thief in the middle of the night, and took it all home and put it on my balcony. I know that dumping in a dumpster that's not yours is illegal but I'm not sure if taking things out is illegal.