His lawyers don’t even have the authority to handle those documents. They have no security clearance, so of course there is no way of knowing if they were returned.
This is a manufactured crisis to distract us from something else. The MSM are downplaying Biden’s blunder and in fact, they are praising him for handling the discovery the right way as compared to Trump’s actions. Never mind it is apples and oranges. Biden is not even allowed to hold classified documents.