If you have the establishment code, visit the PF Office of your Establishment and get the help from the computer operator/clerk, you may have to shell out few out of pocket expenses.
If the above does not favor you, go to online balance check portal of the EPF Website Select the State and district and thereafter enter the establishment code and on the last column is the employee account No., wherein you have to punch serial No. starting from 1 till you reach your name. No doubt it is a cumbersome job but you will get it.