It would require the IP log database from the tracking website and a computer to query it looking for through the list of IP addresses for known Tor exit nodes and then seeing which addresses are tied to those packages. By no means would this take an extraordinary amount of resources or expense. Why would you check a shipment with Tor if you didn't want it to be traced to you? Isn't that the entire point of using Tor? Why would you not want a package to be traced to you? Even if it isn't the majority of packages, I would bet my life that a significantly higher % of packs checked via Tor contain illegal items than packs not checked via Tor. I can say that your name is probably John if you live in the United States and are male. It is also probably significantly more likely for you to fit that profile as an SR member, than for you to be a Chinese female. Go ahead and check all of your drug shipments with Tor if you want. IMO it is a good way to get your shit flagged.