There's a significant amount of physical evidence from that. You'd have to make sure it's clean of any fingerprints and DNA (hair) for one. Plus printers will t

There's a significant amount of physical evidence from that. You'd have to make sure it's clean of any fingerprints and DNA (hair) for one. Plus printers will typically inject watermarks into the document. Handwriting is definitely a thing to be analyzed. And the location which you mail stuff from leaks another few bits of information. It's probably a better idea than email, but not by all that much.