PILFER is correct!

Transcript of audio file:

The thief clearly likes to play games. But why me? Maybe he, or she, thinks I'm an easy mark. Or maybe they were watching… the cold stare of destiny peering down from one of these windows. Either way, they left me another sealed envelope. I can see where their little chess game is going, but eventually, they’ll run themselves into checkmate. Hey, that was pretty good…