Yup. Several times.
The last one, the USPS mail man faked my signature confirmation by scanning his fingertips. They're not all nice guys unfortunately.
:O That's terrible. How'd you find out that he did that?
The USPS site allows you to view the signature digitally. And then, after I opened a case with the Post Office, the carrier fully admitted doing it to both me and his Manager. His story in a nutshell was that he cut corners to save time. He was disciplined (whatever that means, since he's still delivering my mail) and my comics are still gone.