It's probably not the only bit of evidence. "Hmm, it's about the same size, it was printed at about the right time and... yeah it sounds like *that* guy, let's

It's probably not the only bit of evidence. "Hmm, it's about the same size, it was printed at about the right time and... yeah it sounds like *that* guy, let's see what else he printed - oh, nothing? Cool."