In 1951, Bertram Schofield and Thurston Dart's article on the then newly purchased manuscript Egerton 3665 declared that manuscript to be in the same hand as the Fitzwilliam Virginal Book: "The two hands are identical, even down to minute details of erasure, pagination, correction of mistakes and numbering of the content of the books." Noting that two of its pieces had composer attributions abbreviated as "F." and "F.T.", and then adding Drexel 4302 making a group of four manuscripts, Schofield and Dart paradoxically announced their idea of Tregian as copyist was "more probable than ever" while admitting there was "no final proof."