As a Postie myself I can honestly say that the majority of stuff that doesn't arrive is down to person that posted it, no house numbers, addresses that don't exist, God awful packaging, oh and items were never sent in the first place. In the past I've had to call company's about a package that hasn't arrived only to be told,oh it'll be at the post office,theres a back log, and when I say I work there and there isn't a back log,it goes very quiet:)