In the rules for shadows :

if a player has multiple cards in shadows, that player must ensure that those cards can be easily differentiated from one another. A player cannot shuffle or rearrange his or her cards in shadows in a way that disguises the identity of those cards.

What happened if my opponents play “Clever Feint ; Action : kneel your faction card to choose any number of cards you control whit shadow. Return each of those cards in shadow.”

He choose 3 cards, and shuffle those card before placing in shadow, do I know where each card is placed in shadow area?