@CARacing Yes, the tracking has gotten more sophisticated even in the last year.
post edit - just read on USPS that shipper pays for tracking when they ship it, I am sure USC would not pay to enable tracking.
HOW MUCH DOES USPS TRACKING COST?
On the individual package, for any First Class, Priority Mail or Priority Express Mail package, the cost of tracking is very low. It is only $1.05 directly, or you can add it to your online purchase for $0.23. The tracking must be added at the time of shipping.