Hi,
If a person leaves without informing you, the PF department cannot control his actions. He can withdraw by applying in Form 19 & 10C. In the place where the employer's signature is required, he may get the bank manager's signature as this option is available and apply. In case he wants to transfer to the new company, he can apply through the new company using Form 13.
If a person does not know his PF account number, he can visit the PF office concerned where his company's files are maintained, meet the case worker, and try to get the account number. If the PF records are not updated, then he may have to revert back to his employer for his PF account number.
Instead of running away from the job and undergoing all these hassles to get the PF money - would it not be ideal for one to follow the procedures in a company and come out with a clear mind and get the company's assistance in getting his PF money too? Is all this acrobatics worth it? Before thinking of these options of running away, it's better first to find out about the provisions of law that one is trying to break. Maybe the cost of following company rules would be less than the cost of effort for getting PF money without the company's assistance/boss's signature. Think it over.
Regards