If it works and isn't too worn, a 4" barrel square butt model 10 will still fetch $150 pretty quickly even on the EE. I paid more for a good round butt version, and more still for a decent example with a heavy barrel. About double that for one in round butt and 2" barrel. All bog standard police issue / surplus.
If there's a camera involved, I hope it's worth more than $150.
Countless thousands of these have already gone to the smelter. A number of agencies decided to destroy them instead of selling them. Good on Winnipeg that they tried to get their taxpayers a bit of value back. Literally millions of model 10s were made, and there are many, many thousands of model 10s in private Canadian hands. Yeah, with a 4" barrel they'll go to the smelter one day, maybe. If we all just sit around and moan.
Oh yes, and don't forget: if these are your dad's last 12(6) guns, he loses his ability to buy 12(6)s. No big deal as long as there's nothing in the 12(7) category that you or your brother might want... 'cause once he can't buy it, you can't have it. Just a thought.