That's bad advice. Just going to cause resentment IMO. The concept of double checking your own work doesn't really fly in engineering work. Not that everyone

That's bad advice. Just going to cause resentment IMO. The concept of double checking your own work doesn't really fly in engineering work. Not that everyone shouldn't do it but it doesn't tend to add much value to the end product. It is human nature to overlook your own mistakes. In HW development, separate people verify and validate everything. The cost of a mistake getting through is too high to just hope it is all good. The point is that mistakes will always happen. You shouldn't blame staff for being human but the mistakes can't get out the door. If it's that important, a second set of eyes needs to be there IMO. However since this is a post office, really the important thing for the customer is to get in and out as quick as they can. The major complaint is probably the waiting time. So in one sense the employees are helping customer satisfaction by getting them processed quickly!