I'm not saying any of this is likely. But, as the topic was raised, if they break you and you start talking, you will volunteer the information. They don't need to know before hand.
That said, the most practical scenario here is to keep your important files secured somewhere else, cloud or elsewhere, and when they ask you to unlock your phone or laptop you say "Sure!" Because there's nothing to find and you're compliant and helpful so they quickly let you go after a proforma search.
That said, the most practical scenario here is to keep your important files secured somewhere else, cloud or elsewhere, and when they ask you to unlock your phone or laptop you say "Sure!" Because there's nothing to find and you're compliant and helpful so they quickly let you go after a proforma search.