As far as I know, no time limit has been prescribed under the EPF Act,1952 or Rules for preservation of records by the employer. At the same time, the employer cannot be reasonably expected to preserve all the pay-roll records forever either in physical or electronic form.
But, it is an indisputable fact that some of the employers employ people without any record for many years and somehow follow the practice of showing the date of entry into service as only the date from which onwards such employees were enrolled in the EPF. Better, Jitendar, for you to check it. If the employee is able to produce any document like gate pass or ID Card issued to him pertaining to any years from 2002 to 2008, you would be in trouble. Moreover, there is no mention about his date of entry in the post as per your records. No full-quit receipt can be a bar to nullify any financial claim pertaining to earlier years if supported by documentary evidence.