On 10/2/2012 EE came into work using crutches and stated that he had injured his back on 09/18/12 while operating a loader. On 9/18/12, he left work around 3:00AM without notifying anyone of his injury. He called-in sick on 09/19/12. He came back and worked the following days; 9/20, 9/23, 9/25, 9/26, 9/27 and 9/28. He then called in 9/30/12 and 10/1/12.