wever, the statute further provides that the failure to give timely written notice may be excused by the Board if it finds that the claimant had a sufficient reason for the failure to provide timely written notice, the employer had actual knowledge of the accident or the employer was not prejudiced by the lack of timely notice. The courts have further found that the claimant has the burden of showing that the delay in notification did not prejudice the employer, particularly where the accident was unwitnessed. (<em>Zraunig v New York Telephone Company</em>, 32 A.D2d 686 [3rd Dept 1969]). The Court has found prejudice when the delay aggravates the injury or prevents the employer from properly investigating the claim. (<em>Yagaloff v Lincoln Hall,</em> 137 AD2d 955 [3rd Dept 1988]; <em>Pierce v New York Telephone Company</em>, 99 A.D.2d 898  [3rd Dept 1984]).