tell me where was it filled up?
Had to have been done at the factory. They load the cars up there, and put them in train cars without side access. No decent access to the trunks between the loading and unloading in the US. Once they’d been put on a truck for final delivery, it wouldn’t take any effort to unload them at a truckstop along the way. Except, for some reason, that step never occurred, and they made it all the way to the dealer. No telling how many were unloaded along the way.
If the link works, you can easily see the loading yard just east of the factory, and just north of the main storage lot southeast of the plant. https://www.google.com/maps/place/Ford+Hermosillo+Stamping+%26+Assembly+Plant/@29.0148115,-110.9136909,676m/data=!3m1!1e3!4m5!3m4!1s0x0:0x62298de441b66ad9!8m2!3d29.013138!4d-110.9163887