In all honestly, unless you can hack into USPS's servers without blinking, no.If they get a request for an ID, they get a request for an ID and that is all there is to it. Any package getting looked at is probably going to secondary even if you do it through a 3rd party service.The truth is that you don't really need to know. You're just trying to sooth your anxiety levels down to acceptable levels, which is why tracking IDs exist for most people in practice. There is no shipment with a value that requires you know it's exact location from the postal system. It's not like you can swan in and pick it up at any point between source and destination. So the best advice is to relax. Otherwise, if you're not happy, there are two things you can do:1. Obtain a private courier (remember what I said about the value of a shipment?).2. Setup a mobile phone in your shipment to periodically send an email to a usenet group or some other public Internet service. Problem: Mobile phones turning themselves on/off in a postal package could justly be treated to a visit from a bomb disposal technician. But there are smarter ways of approaching the problem (we've discussed this before on here with regard to vendors discovering package interception using light sensitive RFID tags).However, this probably over the top for most people and most shipments in practice.