Card is selected and controlled second from the top. Make some sort of magic gesture, dirty or otherwise. Triple turnover and claim that you’ve found their selection. When they say no, turn the triple over and thumb the top card to the table.
Pressing on, say you’ll do a fancy cut to find their card. Here I like to do a really bad, really labored Sybil-esque flourish cut of some kind. As long as it preserves the top stock. Double turnover, displaying the same card (let’s say the 10 of Spades) you just put down on the table. A bit puzzled, they’ll again say no. Turn it over and thumb it down onto the first tabled card.
Finally, say they’ll find their card. Using your preferred method, force the top card on them. I usually use the Blackstone force. Whatever.
So you’ve effectively shown them all the same card, none of which is theirs. Table the deck. Take this last 10 of Spades and use it to scoop up the other two cards on the table, bringing it to the bottom of the packet. Do a casual Flushtration Count (emphasis on casual), saying something like, “So none of these cards are yours…?”
After the Flushtration, the real selection is on the bottom of the face down packet. Under proper misdirection of your choosing, palm off the top two cards off the packet. Transfer the single card (assumed by the audience to be three cards) to your left hand, then bring your right hand to the tabled deck, unloading the two palmed cards as you spread the deck on the table and say something like, “So if your card isn’t here in the deck…” Then point to the card in your left hand, “…and it isn’t one of these…” You have a lot of flexibility here. Just as long as you get rid of those two cards in some fashion, you’re DTF. I’m actually more comfortable with a cop/palm from the bottom–I just wanted you guys to think I was cool.
End however you see fit, eventually disclosing that you only hold their single selection in your hand.