In absence of appointment letter, you alerady put yourself in trouble. However, you can tell, your PF contribution may not be deposited at PF since you cross age 58. As a result, being an employer, you may not able to meet statutory obligation as per employment laws applicable in India.
Hope, by communicating so and recognising so far contribution, you will overcome the problem,
Thanks & Regards,
20th June 2013 From Netherlands , Amsterdam