They are only "found" if their position is positively identified to a reasonable degree of accuracy.
A 3x5km search site is nothing more than a targetted area. Not a "location" of a "find".
Big difference. Very very big.
If they find the box(es) then they can almost certainly recover them. Not easy. Very difficult in fact, but doable once you have genuinely "found" the items.
The boxes have not been found. That should have been mentioned in those misleading news stories today.