The Adler paper (see below) mentions the following amusing anecdote about what the Chida said about the youthful Rabbi Nathan Adler (1742-1800):
Although he does not mention it, his source is from the introduction to משנת רבי נתן, published in 1862 by B.H. Auerbach:
Auerbach's father was a student of Rabbi Adler, so one presumes he heard it from him.