Firstly, the Postal Service Priority Mail is the best route to ship anything, ever.
+1 on that, as much as possible I try to convince my ebay seller to send priority mail.
It arrives quicker than UPS fed-ex etc...time and time again priority mail has proven faster delivery (for me) than any other method.
And guess what? The K mastersounds I got off ebay recently arrived in the packaging the OP described - priority flat parcel NO padding whatsoever....what were they thinking? I would never do that with a $250 pair of hats!!!!! luckily they were not damaged...but thats priority mail for ya...
When I package cymbals they are over-padded and over taped....