I ALWAYS have the boxes scanned, and usually it means waiting in a 30min line (NYC). One time I was stressing out for 4 days because the package was scanned for the first time once it reached the customer. So it missed a number of scans alone the way. If it missed the last one, I would probably be screwed.
Thanks! I kicked myself for not doing it this time. Hopefully it works out at the end.