Is Caxton Really a Printer?

What we don't have from the period is records saying exactly how many copies he printed, who bought them, how much did he get for it? There's none of that. So maybe this isn't being written down. What we do have this evidence is Caxton continuing to do the same thing. Less than a year later, he actually translates another work and prints that too. And then eventually he kind of in a few years gets the idea to set up shop in England. He goes to London and sets up shop in Westminster specifically. This seems to suggest that it is going well, because you wouldn't do it, of course, if it wasn't going well.