yeah I had that happen a couple of times and with a fair few meds in there. I figure I struck a customs guy who had a bit of sympathy for us with CP. Out of 20 parcels I would say I had 6 opened, 4 resealed with official customs tape saying they had been inspected and sent on, while the other two got confiscated.
I just figured I was lucky!
haven't had any problems since touch wood
cheers
jen