Section 67C(2) in West Bengal Industrial Disputes Rules, 1958
(2)To enable the parties who have filed documents to withdraw the same before destruction, a notice shall be served upon each of them stating that all documents filed will unless taken back previously be destroyed after thirty days from the date of the notice. Such notice shall contain the name of the Court or Tribunal, the number ear and parties of the case in which the documents was filed, and the particulars of the documents. On the expiry of the said thirty days all unreturned documents shall be destroyed without fail.