ON 11/2 EMPLOYEE CAME TO MINE OFFICE & REPORTED THAT HE HAD STRAINED HIS BACK WHILE WORKING ON ASPEED REDUCER ON A SHUTTLE CAR ON 10/12. NO INVESTIGATION WAS MADE AT THAT TIME BECAUSE NO ONE W AS INFORMED OF THE ALLEGED ACCIDENT. (PRIOR TO THIS INCIDENT, HE CAME TO OFFICE ON 10/16 TO REQUEST TIME OFF DUE TO AN AUTO ACCIDENT. HE MADE NO MENTION OF MINE INJURY AT THAT TIME).