How I avoided redeliveries at USPS when the scanner showed an ambiguous address

In my day-to-day, I handle residential routes with small packages, flat mail, and frequent address changes. The problem that made me stop was this: the scanner would suggest a similar address, and the package would end up as a failed attempt. The symptom that made me investigate it seriously was that the label had an apartment number, the DPS didn't match, and the customer had already complained…