This comes with a Frank Caiazzo letter but the letter is in a different style so not sure it's it's an "authentic" Frank letter. Sorry about the quality of the scans.
I don't know if the letter is real or not, but don't depend on ANY COA or LOA from 20 years ago. Especially Rock, since there were so many forgeries back then sold by even top dealers and auctions. The field is much more knowledgeable today.
The Beatles autographs look legit to me...late 1962...I do know that there have been forgeries...and the forgers have made bogus Caiazzo COA's to go along with the fakes...