Delivery confirmation is a rip-off, IMO....
I've used on multiple EBAY packages and they NEVER showed it was delivered, even though I would end up getting positive feedback from the buyer. We sent a defective digital picture frame back from Christmas (since Office Depot was being a PITA about it) and to this day it never showed as being received by the company....even though they got it and sent us back a new one 2 months ago.
To work, the postal worker has to scan the package when they deliver it which leaves too muc room for human error.