The cats coloration might have a lot to do with how many generations removed from the wild it is? If two Bengals with more spots than stripes are bred, and then their offspring are bred for spots, and so on, it would be possible to get a cat with all spots - or all stripes, if that's what a breeder is looking for.
As is true with dogs, the further away from the "wild" ancestor, the more domesticated the animal. So there are Bengals that may have been bred illegally, so might be closer to a big cat in looks and temperament than one who is 10 generations removed. But they are still closer to a big cat than most domestic cats.
So one that is only one or two generations removed could very well look (and act) more like it's wild relatives, and cause someone to think it's a "wild" animal.
The people involved obviously didn't want to cancel their vacation to stay home and give this abandoned (apparently, the mother died) kitten the 24 hour attention it needed, so tried to bring it with them, hoping no one would notice.