Where are my keys?

Lauren: Oh, no! Where are my car keys?
Matt: I don’t know. Are they in your purse?
Lauren: No, they’re not.
Matt: Maybe they’re on the table in the restaurant.
Server: Excuse me. Are these your keys?
Lauren: Yes, they are. Thank you!
Server: You’re welcome. And is this your wallet?
Lauren: Hmm. No, it’s not. Where’s your wallet, Matthew?
Matt: It’s in my pocket… wait a minute! That is my wallet!