If the person absconded from work without information, then wait for 10 days. As per law, if the person absconds without notice, the job can be terminated, subject to a notice served to the present/permanent address after 3 days of lapsing from duty.
Verification of Experience Certificate
Regarding the fake experience certificate, the certificate submitted by him is signed by the past employer, so verify the past employer verification with a signature. If found correct, then the employee doesn't have any fault, even though the past employer issued several work experience certificates to unemployed candidates. The past employer has done social justice for employment to earn and survive. There is no law to punish the employee for this. Yes, if the employee submitted fake educational credentials, then the law binds to punish him for fraud and cheating. Therefore, work experience can be observed through the interview process. Again, you can't issue any warning or show-cause letter to the employee for previous employment, except for illegal activities done in the current organization.
Legal Considerations and Suggestions
My special suggestion is not to become a judge, even though the appointment letter mentions background verification approved by the certifying officer (Labour Commissioner). The certifying officer is not a lawmaker. There is no such law; otherwise, it may be challenged in court by any employee or actual employee later, leading to penalization of the employer.
I disagree with Hiral Mehta and Anil Arora for their incorrect suggestions as there are no rights for action against an employee with subsequent reasons that contravene the law.
I also disagree with Latha-Jadeesan for holding the relieving letter. Don't assume you are a lawmaker with legislative power. If an employee wishes, he/she can lodge a complaint for conciliation in the State Labour Department. If the employer is unable to agree to the employee's request, then it may go to civil court for a verdict in the Labour Court, High Court, Supreme Court, etc. Please don't invite disputes; always try to solve them to the maximum extent with well wishes for future achievement.
Regards