They were never reintroduced in MT. not in N.W MT anyway they were already there.
I used to spend alot of time in what used to be the Lost Trail Ranch in Pleasant Valley in the 90's before it became the Lost trail refugee and I was with a couple of the Ranch hands one day and they took me and showed me were the Wolf dens were at, they had dug into the Bank.
An ole rancher Bob Monk shot one somewhere about 1990 in Pleasant Valley getting into his cows when fish and game finally admitted they were there.