Some documents indicate who provided the information contained in the document. Other documents do not. Even documents that have an “informant” may actually have had several different people who actually provided the information.
How likely was the informant to actually know the information they provided for the document? Where would the informant have obtained the information they provided for the document? Was there any penalty for lying? Was there any reason to lie on the document?
Just because a person could have lied or given incorrect information on a record does not mean that they did. It just means that the potential is there.