You can't TRULY get package tracking with USPS (Post Office) unless you're sending it via Express Mail. Otherwise, the package number that you get is a delivery confirmation number. All you will typically see is that it has entered the USPS system... and then that it has been delivered. Uhhh... and ... that doesn't necessarily mean that it was delivered to the right place, just that is was delivered somewhere.
Don't get me wrong, I love USPS for its more economical pricing. But mistakes can and do happen with them.
If you LOVE this quilt - and don't want to have to worry - then do yourself a big favor and send it with UPS or FedEx. It's well worth the money, when your're sending a treasure.
After all, it's hard to purchase enough insurance to cover the value "priceless"!