Employee brought in Physician's Report of Work Ability to GM on 4/20/05 at 4p. Report stated that EE was totally disabled from work from 4/21/05 to 5/8/05 w/ no DOI listed, but claim #02-816744. This claim relates back to 4/3/02 & 10/22/04. When the GM asked employee what EE did to hurt back, EE replied, ""nothing EE could recall.""