Robbed Cardsharp

From: Cardsharp
Description: Colleague, I appeal to your sense of justice! Your honest and humble servant was robbed yesterday. That’s right! Cardsharp has been played. I stepped out for a moment and an extremely rare object was stolen straight off the card table. Mr. Stone - that’s all I know about the thief. Please help me find what was stolen!
Completed: Thank you for this piece of evidence, I’ll give it to Detective. To find this crook is a matter of pride, and for Cardsharp pride is crucial. I’m sure that righting a wrong will be a great reward for you as well.