I hope you have not lost the postal receipt of the notice sent by you and also the acknowledgement / delivery report of the notice received by the opposite party. That is what is mainly required to prove the notice.
Secondly, I think the printed copy of the notice sent should be sufficient to demonstrate what you sent as a notice. You may mention in your complaint that it is a printed copy of the notice sent.
In the worst situation, please note that as per the provisions of Section 65 of the Evidence Act, even oral accounts of a document may be given as secondary evidence if it proved that the original has been lost or destroyed. Here, in your case, the original of the notice is with the opposite party and what you are proving is only about the office copy of such original document, i.e., the copy of the notice. So, I think the printed copy of the notice may be considered as sufficient; and in the worst situation, by first proving that the office copy is lost you may even give oral accounts of the notice as to its contents.
Dr. Ashok Dhamija is a New Delhi based Supreme Court Advocate and author of law books. Read more about him by clicking here. List of his Forum Replies. List of his other articles. List of his Quora Answers. List of his YouTube Videos.