Service certificate from closed company

The query shall be full facts not "if"  as it is an academic query.

No Board can confer degree for graduation / under graduation.

Submit details to your employer of closed company i.e,, previous employer, "if" so.

The query is too hypothetical to suggest any solution. 

 Thank you all for the reply.        
 I think  losing/missing/damage of certicates do occur right?Few examples
      https://www.quora.com/Ive-lost-my-12th-marksheet-I-studied-at-Tamil-Nadu-India-What-are-the-procedures-to-get-a-duplicate-marksheet-from-the-school    
    https://www.quora.com/I-lost-my-Anna-University-degree-certificate-How-long-will-it-take-to-get-a-duplicate-%E2%80%9Cdegree-certificate%E2%80%9D-from-the-university  

 
     In my case its just to know what incase of lost Service Certificate from closed company . If  the company is not closed then i can request HR department to issue duplicate .  If not is there anything i can do ?
    
Getting Duplicate for 10th , +12    
The duplicate certificate issuing authority for the state is the state education board - “Directorate of Examination”
Candidates can get the Duplicate Copy of Mark List in case of loss of certificate or destroyed by flood or fire.

links for the above
https://www.wikiprocedure.com/index.php/Tamil_Nadu_-_Obtain_Duplicate_Copy_for_Plus_Two_MarkList
https://www.wikiprocedure.com/index.php/Tamil_Nadu_-_Obtain_a_Duplicate_Certificate_for_SSLC