Unfortunately, they are a sub-species of the caribou up north. These mountain caribou are easily mistaken for other caribou.
I'm pretty sure that Mountain Caribou are not limited to 'remaining herds in BC and Idaho'. I recall shooting one last year in YT, and to my knowledge are not an endangered species. Many of them harvested every year.
I'm very impressed by this graduate students research. Probably never even seen one before. Probably not many in mom and dad's basement or the nearest Starbucks though.