Someone was selling usb’s full of shiurim In my shul. To me it looked like they were very cheaply made and probably made in China. Is there any reason to suspect that they would have viruses on them? I don’t suspect the guy selling the ones in shul. I’m just worried about where he got them from. And on the chance they do have some virus, would it have the ability to ruin my car if I plug it into my car?