I saw a driver pull up to the address, get out of the car, then get back in and drive away without ringing the doorbell because the package was too heavy for him. This must be some kind of joke. The driver’s trick is that when they have something heavy or inconvenient to deliver, they pull up to the given address, wait for a minute, and then drive off. This way, any complaint will be checked on GPS, which will show that the driver was at the address, but in fact, the driver didn’t ring the doorbell and didn’t deliver the package. This is how DX courier operate.