Question from John - Information on Baoardo (source of description of Jane Grey)

I've tried every source I know of without success, so I am desperately tossing this out to the general public. On the subject of Lady Jane Grey: there is an oft-cited eye-witness physical description of her credited to a "Baoardo." He is variously described as a Genoan, a Florentine, a merchant, an ambassador, and a resident of London. JA Froude cited him as the author of a work published in Venice in 1558 and supposedly still in the Bodleian Library at Oxford. The librarians there have never heard of Baoardo or his book. Richard Davey states Baoardo wrote letters home to Genoa which are now deposited in a Genovese archive. I have searched every catalogue for every archive in Genoa without seeing Baoardo's name mentioned. I have searched the British Library, every major UK university online catalogue, World Cat, OCLC, Early English Books Online, and many others. None of these revealed any author named Baoardo or any work by him. Do any of the visitors to this site, by some remote chance, know where I can locate solid and reliable information on this elusive sixteenth-century Italian? Thank you!