Blinking, bemused at the finger, Mhairi waits for Bart to finish, whatever she was going to say lost as she considered what he added.
"I am interested in that sort of thing. And extra eyes are always welcome." unless, of course, his curiosity and searching on her behalf garners Their attention...which would be...bad. But that just might mean that the search was or would bear fruit.
"I will," she promises, not understanding, or maybe not seeing the reluctance Bart has as he hands over the card. Once the card is between her fingers, she sees it's dogeared edges and has to ask as she puts it away into a small clutch, "Last one? Or is it your lucky card?"
Blinking up at the man, "Very probably." she says without a hint of shame. She didn't know anything about the art trade, so anything that might come of it would certainly be a surprise.