Employee reported on 8/12/2008 he strained his back on 8/11/2008 while trying to move a spool of wire. He did not need medical treatment at that time. He missed work 8/20/2008 thru 8/24/2008. He presented a slip on 8/25/2008 stating he needed to be off work for this time frame, but could return to work without restrictions on 8/25/2008.