Above principle applies to a defendent!!! and not to a complainant!!!!!
You wrote ......."Plaintiff does not dispute the documents sent/received by him."
But still is not able to produce the originals. Does the plaintiff agree to the contents of the those docs? ........... the photocopies of which are on records?
If the society also has the originals of that 'inward' correspondance and society , while sending the 'outward' correspondance to the plaintiff, was also sending a cc to the defendent also!!!
and .. plaintiff wants to claim he lost it after receiving the those !!! ................. it won't stand frankly!
Also ............................. Plaintiff committing the misrepresentation of facts and telling the half truth and it may cause the prejudice to defendent ........................ and undue advantage to the plaintiff.
The one who expects equity must do equity.
Notice to produce is liable to be ordered against the plaintiff in the interest s of justice and for the facts to come to the fore.
Else adverse inference may be drawn if notice to produce not complied.