I found this one while I was moving a metal table. There was a web inside one of the legs but I'm not sure if it was his/hers or they just happened to be there when I loaded the table. I actually found it after I ate lunch I decided to unload the table and it had a single web strand in between the table legs. It was found in southern Montana. I tried to Google silver backed spiders and it kept coming up with silver argiope but they did not seem to match my photos. I let him/her go out back but I have never seen a spider with such a shiny back.