When running Wifi, try to use 5Ghz or make sure you 2.4Ghz has very low latency (hence my post from the other day).
I carry mine back and forth from my Toronto home to my Montreal office in my personal luggage. My not so dirty laundry does a good job of protecting it. :)
If it is the line on the QuickBooks Payment System Invoice that says "Your tracking ID:" I think that is just a payment transaction number.
If it is a number that starts as 1ZY226Rxxxxxxxx then it is a UPS ID number and you have to check if it is "in motion" or just pre-assigned.