Wife finds paper with talaaq after 4 years

If husband makes talaq salsa papers and signs on it ,he do not give it to his wife because he knew that she is pregnant so he did not give her but after delivery he changed his mood and dones’t give the paper to his wife and the wife doesn’t know about these papers after 4 years she got the papers is this talaaq or not because theres no signiture or witness on these papers please tell me is this talaq or not