We fly out of a small airport where they don't have x-ray scanners for checked luggage (only carry-on; which is kinda funny as all bags get "pink tagged" on the flight to Detroit anyway). If you check a bag, they open it and hand inspect it. Last time we gave them our cooler to check and a young Delta agent unzipped it and was taking his time going through it. I wanted to say "hey buddy, hurry up! That stuff's gotta stay frozen for another 24 hrs!"
The customs agents in the BVI apparently have no interest in seeing what's inside - they just ask the value and wave you on to pay your tax.