Yes that's how it works in many states with Dominion equipment. Milwaukee County WI left one of the USB drives in the tabulator machine, breaking chain of custody. The election official had to call the poll center she was just at, have poll workers look for the missing USB drive, and have a police officer transport the USB drive to the county building so she could upload the votes for that machine. There was also a USB drive stolen in Philly and its purpose was for collecting tabulated results from the ballot scanners. These drives carry encryption keys too, if I'm not mistaken. There was a discovery posted on here that all Dominion machines as well as the central PC running Democracy Suite in a precinct use the same encryption key. If you lose one of these USB drives, someone could use it to break the encryption and do all kinds of.