I am really starting to wonder when UPS and FedEx (and others) will start putting up package delivery boxes, similar to the package cubbies in USPS mail boxes. The porch pirate issue is becoming so egregious these days, normal package delivery has almost no protection from them. These people will come right up onto your porch and root around, looking in other things, to find packages now (I had a couple of empty planters on my front porch, and my main UPS delivery guy and one of the amazon delivery guys was putting packages in there, to try and keep them hidden from the pirates. That worked for a while, but I caught someone sneaking onto my porch the other day, and almost lost a package.
Amazon has started taking photos of the package delivery. I don't know if they send that to the seller as well, but, that is a service that would be really nice across the board. If shippers would actually snap a photo of the delivered package, in its place of delivery, with enough of the surroundings for evidentiary purposes. If these photos were sent to both the shipper and the buyer, that would help with situations like this...
As for what to do when a package goes missing, in all honesty, I have the same questions. I've shipped a number of packages so far. Only one time did I ship to the wrong address (client actually gave me the wrong address and didn't realize it). They were able to get the package in the end, but I did refund their shipping costs due to the mixup. Outside of petitioning UPS, FedEx, and other shipping companies to step up their own game with photos of delivered packages and the like, sadly, it seems like in the end, from a customer service standpoint anyway, it would tend to fall on the seller to deal with missing packages? I mean, how do you know if the buyer is truthful or not, or just lying to get a refund on a package they DID receive? In this day and age, if you indicate you think the buyer is lying, they will usually just take to social media and roast you, hurting your business.