Sender (and recipient) beware...according to a UPS truck loader, there are quite a few ways for things to go wrong. (Warning: strong language and some adult content. Possibly NSFW.) Prepare for the worst, miniaturists!
And it gets worse: according to an experiment performed by Popular Mechanics, items marked "fragile" seem to be singled out for MORE abuse. (Ugh, what is WRONG with people?)
I am especially shocked that Popular Mechanics rated the US Postal Service gentler than FedEx or UPS, since I've had more than a few mailed parcels arrive smashed, with broken items audibly rolling around inside, or simply looking as though they'd been used for baseball practice. When I've had miniatures arrive broken, guess what - all shipped by USPS from within the USA. (Curiously, I've never had anything mailed from overseas get damaged in transit...)
Anyway, to cut a long story short - if I ever need to ship miniatures, I'm shipping them in one of those cheap hard-sided coolers...inside a big wooden crate...and if necessary, I'll tuck the crate inside an old Volvo wrapped in a couple miles of bubble wrap and ship that via truck!