What does ttyUSB mean? Sometimes, the embedded microcontroller does not come with a hardware USB interface. While it is possible to use a software-only USB stack, the additional constraints put onto the CPU and the usually small storage size often lead board designers to include a dedicated UART to USB bridge.
Because of a busy weekend I didn't really follow up other than via emails and this still hasn't been resolved. The consistent word from them was that porting a number sometimes takes 24 to 48 hours.. I spoke to a rep by phone today who promised it would be done within 2 to 4 hours.. It wasn't.
In the US, postal service standard shipping generally takes between 7 to 10 business days for in-stock items. That's weekdays, not including weekends or holidays. The exception to this is when shipping to Alaska, Hawaii or Puerto Rico as that will take an additional 2-3 business days for arrival.