what do you mean he wasn't getting signatures?
if the packages required signatures, what did he do to the diad when it asked for one? signed his own name? that's the only thing that is at all defensible, because it's not actually dishonest. however in my experience almost no one in america signs their own name, as they're supposed to, in similar situations. if he signed their name, that's criminal fraud and he should be thanking jesus he's not in jail or prison for it, you can go to prison for that one even without a complainant. was he just writing "front porch"? here's the heart of the problem: you say he built up a relationship with the customers, but he didn't, the receivers are not the customers despite our supervisors and managers colloquially referring to them as such. in actuality the senders are the customers, they paid for a signature from the receiver and he took it upon himself to stiff the customers.