I have to say that when it comes to shipment tracking, UPS beats the pants off the US Postal Service.
Case in point-- before the holidays - I was expecting the arrival of a holster I ordered for Himself(more on this later). It was shipped Priority Mail on Tuesday from a city not 150 miles from here. And yet, when on Thursday it had not arrived in late afternoon, the clerk in my local friendly post office told me the tracking number was not a good number.(?!) The movements of my package did not appear at USPS.com until AFTER the delivery. It didn't come on Friday, December 23. Thank goodness the local nice folks at the post office cased mail on Christmas Eve and put the package in one of their lobby lockboxes, because that meant I still got it in time for Christmas present for myself and Himself.
Contrast that with experience this week. I decided to celebrate going back to school with a new perfume, which I ordered from Nordstrom on Sunday. The package went into shipment on Monday afternoon and I expect it to be delivered sometime tomorrow. It came from Illinois or somesuch place, and it's moved like a little rocket on its way to me, and I didn't even request express or fast delivery-- this is just the standard shipping.
I know the USPS has the technology to do the same thing, but I wonder what the kink in their system is? *le sigh*