There are multiple sellers for the same product and they could definitely have bad/old inventory - and they will win the buy box with the lowest price - but it’s still not commingled.
Amazon will know but when you write your review or read someone else's, you won't.
Same problem as counterfeit goods and commingling though iirc there are more control in place on perishables so this aspect of the problem rears its head less often.
[†] they can't, we as customers don't have access to the information to know the route items took to get to us
Drones can't go that far. They can only carry tiny payloads. They use a ton of energy just to hover. And lastly- they are much more dangerous than ground-based transport, for the simple reason that _they can fall from the sky_.
Whats to be gained by putting deliveries in the air?