It will be interesting to see if more LB's like this surface after the Long Gun Registry ends in Canada. I believe there are tens of thousands of unregistered guns "hiding" all over the country. We can always hope as they make a great conversation piece.
Generally a firearm like this probably was liberated out the back door just like grey market products are today.
Registering this gun could prove to be very interesting. I think of the "discussions" I had with someone trying to tell me my Lee Enfield "must have a letter prefix" before the serial number...well it didn't and it went downhill from there. With the LG Registry about to take its last breath why bother trying to register it.