This is such an odd thing to be worried about. Do you really think there are people who go around looking for random USBs on the floor hoping that they contain

This is such an odd thing to be worried about. Do you really think there are people who go around looking for random USBs on the floor hoping that they contain sensitive data? Unless someone is specifically following you around and looking for this, I doubt they would bother. I also think anyone smart enough to crack the encryption on that thing is probably also smart enough not to plug random USBs into their computer.