not all replacement devices are in retail packaging. some are ordered in bulk and will be shipped in bubble wrap and not in retail packaging. these are new devices and not refurbished however some may not be in retail packaging. this is why sandisk support instructs you to keep any accessories like earphones and USB cables.
as for warranty it is common not to extend the warranty past the original purchase date. think about it if warranty was extended to the time of replacement you could contact support lie and get a replacement every 11 months and always have a device in warranty. you purchased a device with a 1 year warranty from the date of purchase.
