Babis doesn't ask further about the lockpick. He tells Thancred he can keep it, since he'll be making himself a new one for his birthday that was meant to replace it regardless. It's already given him all the luck he needs tonight, he's been making many friends. He didn't expect so many of the important Summoned would be interested in talking to him.

Inside the lockbox is a piece of parchment that's facedown. The incident was here in Ikorr, not the Nether. He knows better than to break that social contract between his people! Outside of the Nether, everything's fair game. He will drop his voice into a whisper and says he will show Thancred who the wine belonged to.

Then he dramatically flips the parchment over. The other side displays a hand-painted label for a bottle of the Dusk Rose itself.

Babis demonstrates no sign of nervousness or lying. He's relaxed, but he will kid around with Thancred and ask why his friend is so serious.