It doesn’t sound to me that this is about dope — it’s more like people order medications that are non-addictive, just cheaper buying it outside the US, or not available in the US, because of the excessive FDA requirements.
It’s not about “drug dealing,” but the Feds have relied upon FedX to voluntarily cooperate in the past.
From now on, if I were FedX, and the Feds wanted to run some interdiction operations at a hub, I’d say “Go get a warrant.”