Can you provide a link to this information?
I agree that the Motor Vehicle (all terrain) Act of BC provides that all snowmobiles have to be registered (BS tax grab IMHO) but I cannot find anywhere that shows the penalty you state, not even for operation. The only penalty I see in the Act itself is a max $500 fine and that is not immediate - it is upon conviction (of course, the easiest way to get convicted is not fight the ticket and it is assumed you plead guilty).
In addition, the RCMP can do a random pull over to confirm that you have the proper license and insurance to operate your motor vehicle (ie, your truck) on BC highways and roads.
NOWHERE, ANYWHERE IN CANADA, ARE THE RCMP OR ANY OTHER LAW ENFORCEMENT OFFICER PERMITTED TO STOP YOU AND COMPEL YOU TO CONFIRM YOUR LAWFUL OWNERSHIP OF THE GOODS IN YOUR POSSESSION. (Obviously exceptions exist for current investigations, etc)
They are 2 separate things - the cops only have the right to make you pull over and identify yourself because you are operating a motor vehicle.
There is no law that you have to prove ownership of your possessions.
The All Terrain Act of BC covers the OPERATION of ATVs (including snowmobiles), not the POSSESSION.
If a cop, in a 'routine traffic stop'
can ask you to prove ownership of your sleds, why stop there? - how about that ipod, your thermos, the stereo in the truck, those blinging rims and tires, the aftermarket turbo on your truck, your avalanche beacon, etc, etc, etc.
Now, if you are operating the snow machine and they want to see papers....you're screwed, but I'm betting any law enforcement would have a hard time keeping up with 99% of the riders on this forum.