Kinda looks like they are mostly opened, so it's probably just sorting through them looking for the good stuff, and dumping the trash.

It would be interesting to know if they were all given to the same driver (sort of assumed given the questioning of a driver).
Were they marked delivered in the fedex system?
Reported missing/stolen?
Insurance paid out? (lol, good luck)

Could be a secluded spot for a porch pirate to sort through if the details don't fit the driver...