I haven't heard of CBSA or TSA destroying otherwise legal items. I could see an irate owner snapping off the blades when told that it was going to be confiscated. To make sure that nobody profited from the theft of their property his stupidity, bringing such an expensive knife on an air-trip despite knowing that its illegal...I make sure to put my SAK and other prohibited items in my checked luggage, so I don't have problems when being groped. I also prefer not to fly these days, due to these stupid restrictions.
It really does seem like someone was pissed off their SAK was going to be taken and removed all the value of it before it was taken. But I cant picture how exactly... Its not like that woudl be easy to do while in line. Maybe jamming the blades in a door?As it is, it really has no value except if you need new scales for a timekeeper you already have.