I'm being a bit thick I think. Just can't understand the mechanisms used by the French Police.
European Police worked together. No mention of a Venezuelan contact.
Taking that at face value suggests that the package was found at some point during unloading the hold and the trip to the carousel. Is a name check done during that time? Seems unlikely. Sniffer/X-ray after unloading? Not routine surely?
Given that some sleight of hand must have been used at the departure, then a tip-off seems to be the only way to detect this. And thank goodness. In this case.
But if it's that easy, how many are not tipped-off? Terrifying.