These days there is very little that passes through RM's hands that doesn't have some form of tracking. QR codes are put on everything posted at a Post Office, even untracked services. If something were to go missing it could be traced down to one or two individuals. Everyone I worked with at the delivery office always seemed trustworthy. To put it into some perspective, there were occasional spot checks and if you were found with as much as one Tesco Clubcard statement unposted, you were in the shit.