dpd1 - 5:30 am on Oct 1, 2012 (gmt 0)
All that can happen, but there are also things that you can do, which you could never do with the other carriers. I've had stuff mis-delivered or had other issues, and was able to call the local PO at their end... have them talk to the person on that route, and get the item back or resolve the issue. Try something like that with UPS or FedEx. All you would get from them is... "Sorry, we show it as 'delivered'. So is there anything else we can help you with today?" Meanwhile your item is gone forever.