If you go to a university's library, the librarians there are frequently quite good at least finding sources that can lead you to other sources if not directly answering your question. If all else fails, they can probably help you find an expert to e-mail.
I took the liberty of stalking you. I bet you if you e-mailed/visited either of the two people with "Italian Renaissance" here, they could probably directly help you answer your question: https://history.washington.edu/people/faculty
I spent a bit of time trying to answer that question (because I enjoy the exercise of it), and it looks like this would probably be an easier question for a speaker of Italian to answer.
The sample pages of that book suggest there is not very much authoritative information on them and I didn't see an earliest known date of construction of them.
That seems to suggest the middle of the 15th century is the answer to your question since the profession of codega appeared at the same time they were built according to the first article.
I took the liberty of stalking you. I bet you if you e-mailed/visited either of the two people with "Italian Renaissance" here, they could probably directly help you answer your question: https://history.washington.edu/people/faculty
I spent a bit of time trying to answer that question (because I enjoy the exercise of it), and it looks like this would probably be an easier question for a speaker of Italian to answer.
I eventually found this book: https://www.lespressesdureel.com/EN/ouvrage.php?id=11065
The sample pages of that book suggest there is not very much authoritative information on them and I didn't see an earliest known date of construction of them.
https://www.venice-carnival.org/en/approfondimento/3/history...
That seems to suggest the middle of the 15th century is the answer to your question since the profession of codega appeared at the same time they were built according to the first article.
This seems to be relevant too: https://journals.openedition.org/chs/148?lang=en