Submit relieving letters in your possession to your employer 

if employer insist request earlier employers to furnish you relieving letters 

There's no need to give all relieving letters, except the relieving letter from the last employer.

First of all you confirm what is the requirement of your employer and what are his company rules in this regard.

You cannot produce the relieving letters of the sort duration employment of the past if you do not possess them.

You can produce whatever you have in your possession.

As a matter of fact the employer should not demand the previous employment relieving letter other than the current employment which you have resigned to join this new employment. 

He can seek verification of your antecedents subsequently through his sources without harassing you in this manner.

If he is demanding then you will have to comply with demand. No court can direct a private employer not to demand the relieving letters

Hi 

It is practice amongst companies to do a back ground verification check of all employees and in case you do not have relieving letters from all your previous employers, then you can provide the details (tenure, designation, place of posting etc) to your employer for purpose of back ground verification and also admit to not having copies of all your previous relieving letters. 

Your present employment will not get affected on grounds of non provision of relieving letters. 

Hope this information is useful

It depends on you. There is no harm in submission if the conduct and remark on them is not negative