Mystery solved. Yes, there is now, at least on some "3's," a
built-in data-stick.
There are 2 USB-C ports inside the foward console, and 2 USB-A(?) ports (perhaps power-only) behind the console, for rear seat passengers.
From:
Tesla starts delivering cars with TeslaCam/Sentry Mode storage device - Electrek
"Tesla is apparently starting to deliver cars with its own TeslaCam/Sentry Mode storage device." [See last line]
"Sentry Mode is Tesla’s integrated surveillance system inside its vehicles using the Autopilot cameras around the car to record potential vandalism or other incidents.
Tesla owners have to plug a storage device in one of the USB ports in the center console, and footage recorded by Sentry Mode and TeslaCam, the automaker’s dashcam feature, will be stored on it.
The feature was first launched after thieves, especially in the Bay Area, started targeting Tesla vehicles — resulting in a
stream of cars left with broken windows and valuables missing.
It helped police catch thieves, but some were concerned about thieves catching up to the system and stealing the storage device with the footage of the break-in.
We previously reported on how
Tesla changed its design with the Model 3 refresh — adding a USB port inside the glovebox and allowing owners to lock a storage device inside it.
Now we learn that Tesla is even providing its own storage device, according to a closer look at the Model 3 refresh by a Chinese YouTube channel."